If These Walls Could Talk is actually a trilogy of movies, each set in the same house but during different time periods. The synopsis provided in the prompt pertains specifically to the third installment of the trilogy, which was released in 1996.
In the third movie, Olivia (played by actress Anne Heche) moves back to her childhood home to care for her mother after her father's death. Her mother (played by Shirley Knight) begins to claim that there is a ghost in the house, and Olivia becomes increasingly worried about her mental health.
One day, Olivia's mother falls and breaks her hip, and Olivia is forced to hire a health aide to assist with her care. The health aide, named Helen (played by Jada Pinkett Smith), seems too perfect - she's kind, patient, and attentive to Olivia's mother's needs. However, Olivia begins to suspect that Helen may have ulterior motives when she catches her snooping around the house.
In addition to exploring the ideas of aging, death, and grief, If These Walls Could Talk 3 also touches on issues of homophobia and activism. Olivia is a lesbian, and she becomes involved in a feminist organization that is fighting for reproductive rights. The movie culminates in a powerful scene where Olivia attends a rally and speaks about her own experiences with abortion.
Overall, If These Walls Could Talk 3 is a poignant and thought-provoking movie that tackles a variety of social issues.