Last week I got a 2 month old kitten from the Animal Welfare shelter. I
brought her in today with a stool sample because she was vomiting and
didn't seem to be eating much.

They told me she had feline distemper and that it's fatal. Long story
short they took her from me, I'm assuming to be euthanised. I resigned
myself to bad luck, but now in reading up on the disease it seems it's
only 75% fatal in kittens. If this is true I find it hard to accept
that the shelter is just killing her off. Does anyone know if her age
or perhaps some other circumstance could be the reason it's definitely
fatal for her? I had a crying 4 year old all the way home with me, and
I really hope we didn't go through this horrible experience
unnecessarily.