Yeah, I don't think You was treated particularly badly. She might just have been a bit out of her league, being forced to such situations by the no-names having no other manpower. She also made some really bad calls by herself, such as not taking anyone with her to the tournament final, despite being offered the chance to have a partner. Another truth is that a defeat can teach a person ten times more than a victory, which, I believe, might be true for You in particular. Like Ryll said, she wasn't there to conquer the world but to make friends and see interesting things. In the end of the three only Izayoi is a fighting machine. It's possible the girls had never fought a serious fight (or any fight at all) before Little Garden. It was a bit unreasonable all of them had to fight nearly nonstop.