Answer by taking a quote from the following article:

Phillips was born Holly Michelle Gilliam in Long Beach, California, the second child of Joyce Leon (nee Poole), an accountant, and Gardner Burnett Gilliam, a merchant mariner. She has one older sister. Phillips's mother died of a brain aneurysm when Michelle was five years old. Between the ages of six and twelve, Phillips was raised in Mexico City, Mexico, where her father was studying sociology on the GI Bill at Mexico City College.

In 1977, Phillips released her first and only solo album, Victim of Romance, produced by Jack Nitzsche for A&M Records. Commenting on the record, she said: "I didn't do it earlier because I never felt secure enough as a vocalist. I'm good, but Cass was always better." Phillips also commented on her involvement in its production, saying that she had been involved in "every aspect, from mixing to putting together the package and cover myself." Her first two solo singles from the album failed to make the U.S. music charts.  The same year, she sang backup vocals with former stepdaughter Mackenzie Phillips on Zulu Warrior, for her ex-husband's second solo album, Pay Pack & Follow. The same year, she starred as Rudolph Valentino's second wife Natacha Rambova in Ken Russell's film Valentino (1977). The film received mixed reviews, with Time Out London saying: "Structured as a series of flashbacks from Valentino's funeral to his early years in America, the first hour or so of this biopic is Russell's sanest and most controlled work in several years, despite its hollow cynicism."  In 1979, she appeared in the film adaptation of the Sidney Sheldon novel Bloodline (1979), a thriller starring Audrey Hepburn and Ben Gazzara. Released in June 1979, Bloodline received negative reviews from critics, and Phillips's performance (along with those of James Mason and Maurice Ronet) was criticized by Variety as being "drab." The same year, she recorded the song Forever for the movie soundtrack of California Dreaming the same year, a surf film that had nothing to do with her former group.  Her other film credits during this period include roles in The Man with Bogart's Face (1980), Savage Harvest (1981) and American Anthem (1986). On television, Phillips played the mermaid princess Nyah in three episodes of Fantasy Island, and Leora Van Treas in Mike Hammer: Murder Takes All starring Stacy Keach in the title role, and appeared in TV miniseries such as Aspen (1977) and The French Atlantic Affair (1979). She has made guest appearances on series such as Spin City and Star Trek: The Next Generation (where she appeared in the episode We'll Always Have Paris as a former love-interest of Jean-Luc Picard). From 1983-1986 she joined the cast of Hotel as the concierge, the daughter of hotel owner Victoria Cabot's rival, who plants his daughter as a spy to further his aim of acquiring control of the St. Gregory.

was she in any other films?
1979, she appeared in the film adaptation of the Sidney Sheldon novel Bloodline (1979), a thriller