TBM, I'd say pick your battles. Does it really matter what room you sleep in? As long as she isn't disrespecting you etc then that is more important than what room you sleep in IMO. If she's being nasty to you, name calling etc, I wouldn't say you take that sort of treatment. As Sandi said, you do need to stand up for yourself but I personally wouldn't worry too much about details like who sleeps where.
It may not seem like much but believe me, if she's being nice to you and seems to be respectful that is HUGE. It may not change her decision to continue with the D but it's a start.
Me-40,W-37 D7, D5, S3 Separated Oct 3/2013 T 11 YRS M 7 YRS