Hi, Justus4all. I think that the variant reports about what she was wearing when she was found will eventually be sorted out. I think that most such information seems to be filtered through various Peruvian news media who are grabbing police department gossip, much of it second or third hand.
Correction: I see that I was wrong. Apparently she was in just a t-shirt and panties. I do have a suggestion about why she was so attired. It was after five a.m. Stephany had an argument with her father; she didn't want to go home to be confronted by him, so she agreed to come to her new friend Joran's hotel room to stay the night. Perhaps she was thinking of more than sleeping, perhaps not. As a horny young man, he would probably draw other conclusions. When he went for coffee and a bite to eat, she changed into sleeping clothes. Then either she went on the computer and found something OR when he returned he made unwelcome advances OR they had some other argument.