I am so sorry that it has come to this; but it is something that can be surgically repaired. I hope all goes well with the neurologist appointment on Monday.
I will keep her and you and your husband in my thoughts and prayers. You are wonderful and loving people to keep her and make sure she is cared for.
There is a group on Yahoo for AAI. I don't have the link, but will PM one of the members here who had a pup with AAI. I am sure she will be contacting you.