I've been taking care of my neighbors kitten that was abandoned by its mother a few weeks ago. She's about 13 weeks old. Things were going very well. She was very active and happy. She was having solid stool until today. Today I noticed that her poop is watery and yellowish. I haven't changed her food so I don't think its that. Upon closer examination I noticed that it looked like there were undigested pieces of food in it. I realize that she needs a vet and I plan to take her to see him as soon as I can, but I am wondering if anyone has any ideas of what could be wrong.