Question: What role did an actress who was in the 1973 American coming-of-age comedy-drama film co-written by George Lucas play in the sitcom "One Day at a Time"?

Context paragraphs:
The Edge of Seventeen: The Edge of Seventeen is a 2016 American coming-of-age comedy-drama film written and directed by Kelly Fremon Craig.  The film stars Hailee Steinfeld, Woody Harrelson, Kyra Sedgwick, and Haley Lu Richardson.  Principal photography began on October 21, 2015, in Vancouver and ended on December 3, 2015.

Mackenzie Phillips: Laura Mackenzie Phillips (born November 10, 1959) is an American actress and singer best known for her roles in "American Graffiti", as rebellious teenager Julie Mora Cooper Horvath on the sitcom "One Day at a Time", and for the Disney Channel science fiction show "So Weird".

American Graffiti: American Graffiti is a 1973 American coming-of-age comedy-drama film directed and co-written by George Lucas starring Richard Dreyfuss, Ron Howard, Paul Le Mat, Harrison Ford, Charles Martin Smith, Cindy Williams, Candy Clark, Mackenzie Phillips, Bo Hopkins, and Wolfman Jack.  Suzanne Somers and Joe Spano also appear in the film.  Set in Modesto, California in 1962, the film is a study of the cruising and rock and roll cultures popular among the post–World War II baby boom generation.  The film is told in a series of vignettes, telling the story of a group of teenagers and their adventures over a single night.

The Diary of a Teenage Girl: The Diary of a Teenage Girl is a 2015 American coming-of-age comedy-drama film written and directed by Marielle Heller, based on the graphic novel "" by Phoebe Gloeckner.  The film stars Bel Powley as a 15-year-old girl who becomes sexually active by starting a relationship with her mother's boyfriend.  It also stars Kristen Wiig, Alexander Skarsgård, Christopher Meloni, Quinn Nagle, and Austin Lyon.  It premiered at the 2015 Sundance Film Festival and had a limited release on August 7, 2015 by Sony Pictures Classics.

The Wackness: The Wackness is a 2008 American coming-of-age comedy-drama film by Jonathan Levine and starring Josh Peck, Ben Kingsley, Mary-Kate Olsen, Famke Janssen, and Olivia Thirlby.  The film is distributed by Sony Pictures Classics.

Walking Across Egypt: Walking Across Egypt is a 1999 American coming-of-age comedy-drama film directed by veteran director Arthur Allan Seidelman and written by Paul Tamasy, based on Clyde Edgerton's novel of the same name.  "Walking Across Egypt" represents one of the more significant independent films produced in the Florida film industry in recent times.

Hangin' with the Homeboys: Hangin' with the Homeboys is a 1991 American coming-of-age comedy-drama film directed by Joseph Vasquez.  It premiered at the Sundance Film Festival in 1991.  It was released by New Line Cinema.

Angels in Stardust: Angels in Stardust is an American coming-of-age comedy-drama film written and directed by William Robert Carey and starring Alicia Silverstone, Billy Burke and AJ Michalka.  The film is Carey's directorial debut, and is based on the novel "Jesus in Cowboy Boots", which Carey also wrote.  It was released in theaters and on video on demand on February 21, 2014.

Anywhere but Here (film): Anywhere but Here is a 1999 American coming-of-age comedy-drama film, based on the novel of the same name by Mona Simpson.  The screenplay was written by Alvin Sargent, and the film was directed by Wayne Wang.  It was produced by Laurence Mark, Petra Alexandria, and Ginny Nugent.  It stars Susan Sarandon, Natalie Portman, and Shawn Hatosy.

Sing Street: Sing Street is a 2016 musical coming-of-age comedy-drama film co-written, co-produced and directed by John Carney.  Starring Ferdia Walsh-Peelo, Lucy Boynton, Maria Doyle Kennedy, Aiden Gillen, Jack Reynor, and Kelly Thornton, the story revolves around a boy starting a band to impress a girl in 1980s Ireland.  It is an international co-production from Ireland, the United States, and United Kingdom.

Supporting paragraphs: American Graffiti Mackenzie Phillips
Answer: Julie Mora Cooper Horvath