Back in 2005 Sandra did a cameo on this Kevin Bacon movie, starred by his wife Kyra Sedgwick. Sandy is not mentioned on the initial credits and it’s the last name on the ending ones, and wasn’t mentioned on the posters when the movie was released, so mostly people didn’t know she was part of it.
The movie tells the story of a neglected daughter that becomes a possessive mother. The entire film is filled with flashbacks telling her story, and Sandra is ‘Mrs. Harker’, her fantasy mother. I have added screencaptures of the film in the gallery, as well some posters.