Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner, but can you tell me:
Is she dragging the front leg?
If you pinch her toe (do so with care, of course), does she respond like she can feel it?
You noted she was circling, was it in the same direction? Did it seem involuntary or compulsive?
Does Scrat have any known health issues?
How old is she?
Any chance she has had a head trauma or ingested something toxic (ie plants, chemicals, drugs, etc)?