Uh, am I the only one that kinda get why the MC is kinda disappointed in the "dorm" ? She thought she was going to a great place, was really looking forward and just because her aunt made a mistake, she ends up in some rundown place. And one of the first people she met there got pissed at her because she didn't instantly recognized her after 6 years appart at an age when people tends to change quite a bit. I, too, wouldn't be too thrilled and would at least try to see if there's a way to fix the mistake.
Sure, she ended up in a place full of girls who apparently like to show off some skin, but hey, she's apparently not (yet) a raging lesbian. If she ended up in a guy's dorm by mitake, I bet people would be more understanding. :p
It's not like she want to live in a palace, she just want to go where she was supposed (and looking forward) to go.