Some time in ca mid 90’s I watched a movie (on tv, so probably from a bit/while before) that freaked me out. It was about a girl and what happened when she looked in a mirror, or even a puddle that could show her reflection. I think she got swapped over to the ‘other side’ and potentially got replaced by an evil version, but she must have gone back and forth a bit, as it happened several times. Don’t remember much more, but the scene with the puddle sits with me so that’s definitely in there.
Movie was in English, think it was American. Defo in colours.