What I would try in this situation is this: Get her really excited about the new house. Have her go with you and pick out new linen for her bed, with her favourite colour or flower or character on it, select accessories (a nice pink lampshade?) etc. for her own room. Make the room something to be excited about and proud about.
Then, put her crib mattress on the floor in your room. If she feels afraid in her own room, she can always come sleep in your room.
My dd (2.5yo) just recently developed an attachment to a soft toy and if she has that in the room with her, she's absolutely fine. I don't know how it happened, it was while I was in France for a week, but somehow the little monkey helps her feel secure in her bed.
I don't know if this helps you at all!
Bedtime stress can be so hard.