Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with your wee one today.
In this situation, if she her legs are weak but she does have voluntary movement, then we likely have a situation of discomfort or muscle damage (as opposed to nerve damage that would cause paralysis and would be a negative prognostic indicator for her).
In this case, we'd really want to ring the vet who saw her for bird safe anti-inflammatories here. These will help manage the pain she surely has (even if she is putting on a brave face as prey species do), reduce inflammation, and help us get her mobile again. If you cannot get ahold of them, then for the short term you can give her a low dose of Ibuprofen (7mg per pound of her weight every 12 hours). This should be given after food and its usually easiest to use children's liquid versions for ease of dosing.
Overall, if she can move the leg and the claws, then we'd be most suspicious of pain/muscle damage here and would want to ring for pain relief for her. Though if she cannot move her claw at all, then nerve injury would be another worry for her. In any case, we would want to consider speaking to he vet about anti-inflammatories (steroids if nerve issues are suspect) to keep her comfortable and give her the best chance possible for recovery.
Please take care,