This is a nightmare, isn't it? Is that female classmate hostile to you or incompatible with you? If there is no friction with you, this dream may be caused by the sleeping environment. Did you take a bath before going to bed? Do you feel comfortable and tired when you sleep? Too much sleep during the day leads to poor sleep quality at night. Is the indoor temperature too high when sleeping? These external factors may give you nightmares.
She came to see you. Did you do something wrong to her? Did you let her hang herself? If not, then there is nothing to worry about. In the movie, there are people who come to the living after death, but they come for help.
In fact, you should know that you are kind, upright and have a clear conscience, and those accidental dreams mean nothing.