Question: Who did the actress who played Jackie Cook on Veronica Mars play on Grey's Anatomy?

Context articles: Play It Again, Dick
List of Veronica Mars episodes
The Bitch Is Back (Veronica Mars)
Tessa Thompson
Veronica Mars (character)
Weevils Wobble But They Don't Go Down
Mars, Bars
Krysten Ritter
There's Got to Be a Morning After Pill
Losing My Religion (Grey's Anatomy)

Play It Again, Dick is an American meta comedy web television series that was released on The CW's online platform, CW Seed, on September 16, 2014.
 It functions as a short spin-off series of the teen noir show "Veronica Mars", which aired between 2004 and 2007; the show contains appearances by most of the original starring cast.
 The series follows a fictionalized version of Ryan Hansen as he attempts to convince his "Veronica Mars" cast-mates to participate in a spin-off centered around his character, Dick Casablancas.
 The series was created and executive produced by Rob Thomas, produced by Danielle Stokdyk and Ryan Hansen, written by Thomas and Bob Dearden, and directed by Viet Nguyen.
"Veronica Mars" is an American television series created by Rob Thomas.
 The series ran for three seasons; it premiered on September 22, 2004, during UPN's last two years, and ended on May 22, 2007, after a season on UPN's successor, The CW.
 The series balances murder mystery, high school and college drama, featuring social commentary with sarcasm and off-beat humor in a style often compared to film noir.
 Set in the fictional town of Neptune, "Veronica Mars" starred Kristen Bell as the title character, a student who progressed from high school to college during the series while moonlighting as a private investigator under the wing of her detective father.
 Episodes have a distinct structure: Veronica solves a different "case of the week" while continually trying to solve a season-long mystery.
 The first two seasons of the series have a season-long mystery arc, in which the conflict is introduced in the first episode of the season and resolved in the finale.
 The third season takes on a different format, focusing on smaller mystery arcs that last the course of several episodes.
"The Bitch Is Back" is the series finale of the American mystery television series "Veronica Mars", the twentieth and final episode of the show's third season, and the 64th episode overall.
 Co-written by series creator Rob Thomas and executive producer Diane Ruggiero and directed by Michael Fields, the episode premiered on The CW on May 22, 2007, directly after the previous episode, "Weevils Wobble But They Don't Go Down".
 The series depicts the adventures of Veronica Mars (Kristen Bell) as she navigates life as a college student while moonlighting as a private detective.
Tessa Lynne Thompson (born October 3, 1983) is an American actress and musician.
 She played Jackie Cook on the television series "Veronica Mars", Sara Freeman in the period crime drama "Copper", Nyla Adrose in the film "For Colored Girls", civil rights activist Diane Nash in "Selma", and Bianca in "Creed".
 She stars as Charlotte Hale on the HBO series "Westworld".
Veronica Mars is the fictional protagonist, occasional narrator (through voiceovers), and antiheroine of the American television series "Veronica Mars", which aired on UPN from 2004 to 2006 and on The CW from 2006 to 2007.
 The character was portrayed by Kristen Bell through the duration of the series.
 Following the show's cancellation, Bell reprised the role in the 2014 film continuation.
 The character, created by Rob Thomas, was originally male and the protagonist of his unproduced novel "Untitled Rob Thomas Teen Detective Novel", which eventually became the basis of the series.
 After the work's transition from novel to television series, Thomas changed the character's gender from male to female as he believed a noir piece told from a female point of view would be more interesting.
"Weevils Wobble But They Don't Go Down" is the nineteenth and penultimate episode of the third season of the American mystery television series "Veronica Mars", and the 63rd episode overall.
 Written by Phil Klemmer and directed by Jason Bloom, the episode premiered on The CW on May 22, 2007.
 The series depicts the adventures of Veronica Mars (Kristen Bell) as she deals with life as a college student while moonlighting as a private detective.
"Mars, Bars" is the fourteenth episode of the third season of the American mystery television series "Veronica Mars", and the fifty-eighth episode overall.
 Directed by Harry Winer, with a story by Phil Klemmer, John Enbom, and Joe Voci and a teleplay by Klemmer and Enbom, the episode premiered on The CW on February 20, 2007.
 The series depicts the adventures of Veronica Mars (Kristen Bell) as she deals with life as a college student while moonlighting as a private detective.
Krysten Alyce Ritter (born December 16, 1981) is an American actress and former model.
 Ritter is known for her roles as lead superheroine Jessica Jones on the Marvel Cinematic Universe series "Jessica Jones" and "The Defenders", Jane Margolis on the AMC drama series "Breaking Bad", and Chloe on the ABC comedy series "Don't Trust the B---- in Apartment 23".
 She has appeared in films such as "What Happens in Vegas" (2008), "27 Dresses" (2008), "Confessions of a Shopaholic" (2009), "She's Out of My League" (2010), "Veronica Mars" (2014), and "Big Eyes" (2014).
 She has also appeared in roles "Gravity", "'Til Death", "Veronica Mars", and "The Blacklist".
"There's Got to Be a Morning After Pill" is the twelfth episode of the third season of the American mystery television series "Veronica Mars", and the fifty-sixth episode overall.
 Directed by Tricia Brock, with a story by Jonathan Moskin and David Mulei and a teleplay by Moskin, Phil Klemmer, and John Enbom, the episode premiered on The CW on February 6, 2007.
 The series depicts the adventures of Veronica Mars (Kristen Bell) as she deals with life as a college student while moonlighting as a private detective.
"Losing My Religion" is the twenty-seventh and final episode of the second season of the American television medical drama "Grey's Anatomy", and the show's 36th episode overall.
 Written by Shonda Rhimes and directed by Mark Tinker, the episode was originally broadcast with "Deterioration of the Fight or Flight Response", in a two-hour season finale event on the American Broadcasting Company (ABC) in the United States on May 15, 2006.
 "Grey's Anatomy" centers around a group of young doctors in training.
 In this episode, Dr. Izzie Stevens (Katherine Heigl) and her fellow interns have to plan a prom for Dr. Richard Webber's (James Pickens, Jr.) niece Camille Travis (Tessa Thompson).
 Further storylines include Dr. Preston Burke (Isaiah Washington) recovering from his gunshot wound and Denny Duquette's (Jeffrey Dean Morgan) death following his seemingly successful heart transplant surgery.