We discovered a 9 or 10 week old kitten outside of our home and decided to make her a part of the family. She is a calico and we are a little concerned for her because she is very emaciated and cries a lot. It is evident that someone had her before she found us but, what can we do to help her gain some weight besides feeding her? She can barely hold her head up and is very listless....she is eating and drinking water but, she is still so weak....any advice would be great.....