I had a kitten born 2/29/08 she was the runt of the litter she didn't seem to grow very much she still fit in the palm of my hand and she was almost 3 months old she would get a runny nose and her eyes would shut but they would open back up Saturday night she was running all over the place Sunday morning she seemed all right I left for a couple of hours and when I came home she was lifeless and a few hours later she died. I was just wondering what would cause this