Trying to remember this film I saw in the 90s as a young kid – though I could be confusing myself with several films!
There was a group of guys and a girl who had long hair, she always wore large sweaters. She died somehow (she exploded I think? I remember it was violent) But ended up coming back at the end of the film (she was alive after all!!) and appeared into this building to meet with the boy she had a crush on. Could have been a dance or prom.