“supposedly there were 4 boys there and 2 other girls”
Those girls probably knew her.
If they heard her scream just once they would have been concerned and inquired.
Even if they didn’t know her, a scream would have upset them and the boys downstairs.
OTOH...she did get out of the bedroom and thagt's the end of her "story". But surely someone must have seen her leaving/noticed that she was no longer there. And HOW did she get home?
There weren't any cell phones in 1982.
At the age of 15, she couldn't drive.
Who goes to a party wearing a bathing suit under one's clothes and not bringing underwear for later and where were her house keys?
Did her parents not notice anything when she did get home?
Had she been drinking?
So many questions that she has NO answers for!