A group of young women (sorority sisters, maybe) staying together are killed one by one. The main character is seen ice skating on a frozen lake, with music from a record player coming from the shore. If I’m remembering correctly, you keep expecting her to be stalked as well, but she turns out to be the killer.
Curtains (1983)
https://www.imdb.com/title/tt0085385/
Yes!!! That’s the movie. I got the facts wrong, but I knew the ending was a twist. Thanks so much!
Solved!