Acting Forced to give up dancing because of complications stemming from her back injury, Tilly moved to Los Angeles to pursue a career as an actress and studied acting under
Peggy Feury. She made her television debut in the 1982 half-hour drama
The Trouble with Grandpa, co-starring with
Elisha Cook Jr. After playing a prostitute in a second-season episode of
Hill Street Blues, she appeared in her first starring role in the 1982 coming-of-age adventure film
Tex with
Matt Dillon. In 1983, after she starred as the lead in the
supernatural horror film
One Dark Night, she appeared in
Psycho II with
Anthony Perkins, and Lawrence Kasdan's award-winning ensemble film
The Big Chill, with
Kevin Kline,
Glenn Close,
Tom Berenger,
William Hurt,
Jeff Goldblum,
JoBeth Williams and
Mary Kay Place. Tilly's appearance in
The Big Chill, which was nominated for three
Academy Awards, including Best Picture, helped her career significantly. Tilly later appeared in
Valmont (1989),
The Two Jakes (1990) with
Jack Nicholson and
Leaving Normal (1992) with
Christine Lahti, as well as the 1993 horror film
Body Snatchers. After this, she stopped acting for the next 15 years. Tilly returned to acting in 2010, portraying the Blessed Mother, a Pope-like figure in the
Caprica episode "
Unvanquished". In 2011 she played Martha in
Edward Albee's ''
Who's Afraid of Virginia Woolf?'', presented by the Blue Bridge Repertory Theatre in Victoria, B.C. In January 2012,
Global in Canada launched the six-part
Bomb Girls about women who work in a munitions factory during World War II. Tilly stars as Lorna, the emotionally closed floor matron who blossoms as a leader and an appealing woman. She won the 2013 Lead Actress, Drama
Canadian Screen Award for her work on the series.
Writing Tilly is the author of multiple published novels. In 1994, Tilly's first novel
Singing Songs was published by Dutton to generally positive reviews. Donna Rifkind from
Publishers Weekly called the book "an impressive first novel", and the
New York Times Book Review praised Tilly for "the remarkable coherence and clarity" of Anna's narrative voice. The book is about a young girl and her sisters living in the Northwest who are molested by their stepfather. Her second novel
Gemma was published in 2006 by the Syren Book Company. and picked up by St. Martin's Press in 2010. The book is about a twelve-year-old girl who is kidnapped and taken on a cross-country journey in which she is physically and sexually abused by her captor. The book is about a twelve-year-old girl, Jacqueline "Jack" Cooper, whose life is shattered by the death of
her father by
friendly fire in the
War in Afghanistan. The novel is about a sixteen-year-old who is molested and physically abused by her mother's boyfriend, and must deal with the trauma alone without the help of her mother or best friend. A departure from the darker themes of Tilly's previous work, the novel is about two young girls who become friends who experience the "comical, sometimes bittersweet and melodramatic trials and tribulations of tweenhood". One reviewer wrote, "Tilly paints an insightful, memorable portrait of the ups and downs of friendship and the unwavering bonds of family, delving into age-old issues of honesty, trust, and loyalty. In 2018, Tilly published the first of three books in her
Solace Island trilogy, a series of romantic thrillers about a young woman, Maggie Harris, dating a mysterious handsome man after recently being dumped by her fiancé. It was quickly followed by two sequels, ''Cliff's Edge
and Hidden Cove''. In 2021, Tilly's latest novel, the new romantic thriller
The Runaway Heiress, was published. ==Personal life==