You are probably better moving out and staying out rather than going back, moving out again, going back again.....lather, rinse, repeat.....that will hurt everyone more than just doing it once and being done with it.
Is there any way you could go over and get some of your D3's bedroom furniture? Maybe her bed, dresser, a bunch of stuffed animals? Having things around them that they find familiar can be a big step in helping kids adjust to change.