I'm new to caring for cats, but find myself with a sick feral kitten. I've tnr'd her and most of the others in the colony. But know nothing about their health issues. Two days ago she was very active and playful. Yesterday and today she is listless and not feeling well. She threw up a tiny bit of yellow saliva with a blade if grass in it and just a while ago yellow Siva. She drank just a bit of water but certainly doesn't look well. Any advice for this little old lady to do for this beautiful tiny kitten.