Many more prayers for Katie and a whole lot of {{{{{HUGS}}}}} for you.
Just as a word of encouragement, my co-worker has a Boston Terrier, about 13, who recently had what they concluded was a small stroke. But at the time, she had no idea what happened, only that the dog was off balance and would fall over etc. The vet never actually did anything, (there was nothing really to do, he said) but the dog got better on her own.
Hang in there.......Katie is in good hands.