That is a beautiful sweet litle kitten - I thought Casidy might suit her with her set of lungs I really hope her leg heals quickly. Did the vet say it was string or the umbilical cord still wrapped around her leg?

I have seen that happen when I was volunteering at the rescue centre. A person bought in a whole mess of kittens (literally) and one very sick mum because the cords were all entangled around each other. The unfortunately couldn't save mum and 2 kittens. The other 2 were adopted out.