"Ghost Cat" or "Mrs. Asboro's Cat" is a family film from 2004 starring a young Ellen Page, Michael Ontkean who at 58 here still looks like he did on The Rookies, Lori Haller, and Shirley Knight as Mrs. Ashboro.
The story concerns an elderly woman (Knight) and her cat Margaret, both of whom pass away. Mrs. Ashboro had her house up for sale, at her nephew's prodding, which is when Wes Merritt and his daughter Natalie (Ontkean-Page) look at the house. Then she changes her mind.
Margaret the cat shows up to help Natalie, her dad, and the animal shelter owner (Haller) from time to time, especially as people are trying to destroy the animal shelter in order to get the property. It looked to me as if the producers used an older cat for Margaret, which makes sense.
This was cute. Not everything has to be bloodshed or special effects. Every once in a while, a story about a ghost cat is all you need.