S.W.
Is there anything wrong with sleeping together, for now? It does not need to be anyone's "fault", instead it can be a very nice solution.
I am a divorced mother (for 4 years) of a now 8 year-old girl. We live in a one-bedroom apt by choice and share a bedroom. We have a bunk bed (double on bottom, twin on top) but most nights she's with me (she's with Dad 1/2 the time) we share the double bed. It's her way of spending as much time with Mom as possible. I don't mind it either, for that same reason. She is the most well-adjusted kid I know - independent, out-going, doing great in school, lots of friends, etc. She sailed through the adjustment to two households like a breeze. She just likes close time with Mom.