I'm so sorry you are going thru this!
I'm sure you must be really upset. She's so precious, I really hope it turns out to be nothing bad. Does she eat good? Or is she a picky eater? I would ask her breeder if her parents had any walking problems at her age or any other problems such as livershunt, etc. Which I REALLY hope is not that! But it could be something genetic. Please update us. I really hope everything turns out to be fine. I will keep her in my prayers.