Question: Who wrote the book on which a musical was based which featured the song She Used to Be Mine?

full_context: Document 1: Jessie Mueller: Jessica Ruth "Jessie" Mueller pronounced MEW-ler (born February 20, 1983) is an American actress and singer. She started her career in Chicago and won a Joseph Jefferson Award in 2008 for her role as Carrie Pipperidge in "Carousel". In 2011, she moved to New York City to star in the Broadway revival of "On a Clear Day You Can See Forever". She won the 2014 Tony Award for Best Actress in a Musical for her performance in the lead role of Carole King in "," and originated the lead role of Jenna in the musical "Waitress" on Broadway.
Document 2: The Waitress (It's Always Sunny in Philadelphia): The Waitress is a fictional character on the FX, now FXX series, "It's Always Sunny in Philadelphia", and is portrayed by Mary Elizabeth Ellis. The Waitress is a waitress at a Philadelphia coffee shop who is frequently stalked by an enamored Charlie Kelly. The Waitress's real name is never revealed and no one in the gang can remember it despite knowing her for several years.
Document 3: Kaleidoscope Heart Tour: Kaleidoscope Heart Tour was the concert tour by American singer–songwriter Sara Bareilles, in support of her second studio album, "Kaleidoscope Heart".
Document 4: The Waitress: The Waitress is the second album by folk singer-songwriter Jonathan Byrd. The album was released in 2003, the same year that Byrd won the New Folk competition at the Kerrville Folk Festival. "The Waitress" reached #20 on the Folk Radio Airplay Chart and has been noted for Byrd's lyrical character sketches and deftly played guitar.
Document 5: Should've Been Us: "Should've Been Us" is a song recorded by American singer and songwriter Tori Kelly for her debut studio album "Unbreakable Smile" (2015). Written by Kelly with Ludvig Söderberg, Jakob Jerlström, Oscar Holter, Laleh Pourkarim, Alexander Kronlund and James Alan, and produced by The Struts and Holter, the song was sent to US mainstream radio as the second single from the album on June 2, 2015. A remix of the song featuring American singer Jeremih was released digitally in the United Kingdom on September 10, 2015, as Kelly's first single there.
Document 6: Sally (musical): Sally is a musical comedy with music by Jerome Kern, lyrics by Clifford Grey and book by Guy Bolton (inspired by the 19th century show, "Sally in our Alley"), with additional lyrics by Buddy De Sylva, Anne Caldwell and P. G. Wodehouse. The plot hinges on a mistaken-identity: Sally, a waif, is a dishwasher at the Alley Inn. She poses as a famous foreign ballerina and rises to fame (and finds love) through joining the Ziegfeld Follies. There is a rags to riches story, a ballet as a centrepiece, and a wedding as a finale. "Look for the Silver Lining" continues to be one of Kern's most familiar songs. The song is lampooned by another song, "Look for a Sky of Blue," in Rick Besoyan's satirical 1959 musical "Little Mary Sunshine".
Document 7: 9 to 5 (musical): 9 to 5: The Musical is a musical based on the 1980 movie of the same name, with music and lyrics by Dolly Parton. It features a book by Patricia Resnick, based on the screenplay by Resnick and Colin Higgins. The musical premiered in Los Angeles in September 2008, and opened on Broadway in April 2009. It received 15 Drama Desk Award nominations, the most received by a production in a single year, as well as four Tony Awards nominations. The Broadway production however was short-lived, closing in September 2009. A national tour of the US launched in 2010, followed by a UK premiere in 2012 and returns to the UK in 2017 in a new production at The Gatehouse in London with a West End cast, as part of a fringe festival.
Document 8: Waitress (musical): Waitress is a musical with music and lyrics by Sara Bareilles, and a book by Jessie Nelson. Based on the 2007 film of the same name, written by Adrienne Shelly, the musical tells the story of Jenna Hunterson, a waitress in an unhappy marriage to her husband Earl. When Jenna unexpectedly becomes pregnant she begins an affair with her gynecologist Dr. Jim Pomatter. Looking for ways out she sees a pie contest and its grand prize as her chance.
Document 9: Sara (Starship song): "Sara" is a 1985 song recorded by the American rock band Starship which reached number-one on the U.S. "Billboard" Hot 100 chart on March 15, 1986. It was sung only by Mickey Thomas, of the newly renamed band Starship, from their first album "Knee Deep in the Hoopla"; for this single, Grace Slick only provided the backing vocals.
Document 10: Ingrid Michaelson: Ingrid Ellen Michaelson (born December 8, 1979) is an American singer and songwriter. Her first album, "Slow the Rain," was released in 2005, and she has since released six more albums, "Girls and Boys," "Be OK," "Everybody," "Human Again," "Lights Out," and her most recent, "It Doesn't Have to Make Sense." Her two highest-charting singles are "The Way I Am" and "Girls Chase Boys," at No. 37 and No. 52 on the "Billboard" Hot 100, respectively. She played the role of Sonya Rostova temporarily in the musical, Natasha, Pierre & The Great Comet of 1812 from July 3rd to August 13th while actress Brittain Ashford was on leave.
Document 11: She Used to Be Mine (Sara Bareilles song): "She Used to Be Mine" is a song written and recorded by American singer-songwriter Sara Bareilles for her fifth studio album, "" (2015), featuring songs from her stage adaptation of the 2007 film, "Waitress". It was released to digital retailers as the lead single on September 25, 2015.
Document 12: Elizabeth Searle: Elizabeth Searle is an American novelist, short story writer and playwright. She has a new novel forthcoming in 2016 and a NYC festival production of her rock opera in 2015. Her works have included the novel "A Four Sided Bed" and the short story collections "My Body to You" and "Celebrities in Disgrace". Her most recent novel "Girl Held in Home" was published in 2011 by New Rivers Press. She wrote the libretto for "Tonya and Nancy:The Opera" which was produced in 2006 and 2010 and 2014. She also wrote the libretto for the full length musical, "Tonya and Nancy: The Rock Opera" which is being produced in NYC as an official Full Production show at the New York Musical Festival (NYMF) in July, 2015. The show premiered in February 2008. A full production was presented in Boston in 2011. A new 'rock concert' production was performed in sold-out club dates in Hollywood in February 2014. Searle's theater works have drawn national media attention.
Document 13: Me (Empress Of album): Me is the debut studio album by American singer and songwriter Empress Of, released on September 11, 2015 through XL Recordings and Terrible Records. Finding her residence of New York as stifling to her creative process, Lorely Rodriguez embarked on solo writing retreat to Mexico which granted her the introspection she was seeking. Work on the album continued for a further two years, culminating in a direct approach to her lyrics and production.
Document 14: List of songs recorded by She &amp; Him: She & Him is an American musical duo consisting of members Zooey Deschanel and M. Ward. They have recorded songs for six studio albums and an extended play (EP), as well as various other releases. The two formed the band after working on their rendition of Richard and Linda Thompson's "When I Get to the Border", which included on the soundtrack of Martin Hynes's 2007 film "The Go-Getter" and was used during its closing credits. Described as "a collection of vintage-sounding country-tinged songs", their debut album "Volume One", released under indie label Merge Records in 2008. Deschanel wrote all of the album's original tracks, except "Sweet Darlin'", which she co-wrote with Jason Schwartzman.
Document 15: When She Loved Me: "When She Loved Me" is a song written by Randy Newman and sung by Sarah McLachlan for the Pixar film "Toy Story 2". It was nominated for the 1999 Academy Award for Best Original Song. It was covered by Jordan Pruitt for "Disneymania 5" and also by the pop group Steps on their 2012 album "Light Up the World".
ground_truth: Jessie Nelson