Ugh, sorry to hear you've got someone so ungrateful living with you right now. :( I hate it when people do that. It's not their place to be complaining about anything when they're only there because you guys are being kind enough to let her stay.

And it's certainly not their place to complain about imaginary things, either. I can't hear anything outside of my room when my only air conditioner is on (granted, the air conditioner is right outside of my room, but still) and I have better hearing than the average person. Plus, people like us who live with other people and are up all night are used to being quieter anyway.

Hopefully you won't have to deal with her for too much longer.