Lots of questions:
Does she seem to be in pain?
Has this just recently started or has she always done this?
What does her breeder say?
If this is new and she seems to be anxious or in pain, I'd take her to the vet.
My boy spins, especially if he is having a bout of diarrhea.
I hope your little one is okay.
@mark This might be an unintended lesson she learned at the breeder. Perhaps she was in a pen of sorts and had to indicate that she needed to be lifted out of the enclosure so she could potty. Or, she would dance to tell her breeder/owner to let her out. Or, she learned to stand at the door to go out. It could be a number of things.
Consider it a blessing, if you see her "standing" against the door/wall/etc, it's her que that she needs to potty. She's trying to train you (um, er... communicate with you) to let her out.