The Movies mom is an unnamed woman who briefly appeared in Gremlins 2: The New Batch in the middle sequence where the movie itself breaks down due to the gremlins messing with it in the projectionist booth of a NYC Movie Theater.

Gremlins 2

The movies mom and her daughter, walk out of the theater to confront the theater manager, to conplain that it’s worse than the first Gremlins. The manager responds to her that they're only showing the movies, and not making them.