Am I the only one who feels that you should first try to find Miss Kitty's family? You don't know the circumstances. Some little child could be crying their eyes out because their kitty got out of the house. I'd walk around the neighborhood where you found her and ask folks if they lost a cat.

My 17-year old cat (Kuhio) was "rescued" by a neighbor who called Animal Control. She was put to sleep at the shelter before we found out she was there. My husband and I were out of town and our house sitter didn't even look for Kuhio when she noticed the food wasn't being eaten. If she had walked around the neighborhood (or if my neighbor had before she called Animal Control), Kuhio would be home now with her loving family. She was only 4 houses away!

I'd try to find Miss Kitty's owner. If they don't want her back, I think you've got yourself a new baby.