I foster kittens for a local cat rescue, and I'm concerned about one of my current fosters. I got her quite a while ago, and a few weeks ago, she became very sick. Her rectum prolapsed, and that drove me to ask about her overall health and lethargy. She was taken to a vet's and stayed the night on IV fluids and was sent home much better, and has been ever since. I recently had to return her to the shelter while I went on vacation, and she did very well there, and was running about from room to room when I went to pick her up. However, the day after, which would be Wednesday the 9th, she became lethargic once more. I assumed it was the change or something, but Thursday came and she was even worse. She is normally the perfect kitten, affectionate and loving, always purring nearby and giving little kisses, but that day she only wanted to stay flopped on her bed. Today, I noticed a limp, and found that when I spread her front right leg from her body, it was painful. Telling the person kn charge of the shelter this, it was diagnosed as a sprain, and I was told it would get better with a few days of rest. However, this evening, I am more worried than even about her, as the limp seems to have moved to her back left leg, and she is perhaps even more lethargic than when she was anemic. She has also lost a few ounces, and weighs about 2 lbs. and 10 oz., although she was born on April 6th, and her sister weighs more than a pound more than her. Could this be a relapse of anemia? Or something else? She'll probably be taken to the shelter tomorrow for a more through look over, but I'd like some more ideas, if anyone has them. Thank you!