I saw this movie on TV around 1989, so it was around then or before. It’s a thriller where I believe a woman is being stalked. She walks into a bedroom and sees a rattle snake on the bed, and it’s about to attack. She then shoots the rattle snake with a gun. Does this sound familiar?
Nadine (1987)
https://www.imdb.com/title/tt0093596/
This is it! Thanks!