Help!

If I were you, I would meet with the DON and explain your concerns. Make sure she knows that this situation is intolerable to you and that if it cannot be resolved then you will give notice. I wouldn't quit without giving notice- it could come back to haunt you later. I know of one person (actually I used to work with her) who did something similar- she quit after only a couple of weeks at a facility and did not give notice. She also didn't include it on her job application, and got a job she LOVED at another facility. The bad news is that three months after she started, her former supervisor was hired on at the same facility. Just like that she was fired for not including the first job on her application for the second.
I would meet with the DON as soon as you can, so that your 2 week notice could begin as soon as possible if she refuses to give you a permanent hall to work on.