I don't think that result was even strange. They were both very drunk, staying the same place, she didn't go back to her room at the end, and she told the similarly drunk guy she was cold - a standard hookup line to initiate hugging, which is all that happened.
I've gotten clothed hugs from friends regularly who would never sleep with me. I've gotten hands under clothes both other people's under mine touching genitals and mine under theirs in bars and at pools and beaches and the like with people I had only met that one time. I think it is wrong that it happened in this case where she didn't want it, but it just doesn't seem the world ending thing to me like she treated it.