She was adorable Jane- and I agree a very nice foal! I also agree, you had to try, and you did. Hugs again to you and glad the mama is doing ok. Funny, she must have known, and I have seen this before with animals, not real keen on their babies and sure enough, something is wrong. It's like they know by instinct (Like when the mama birds push the sick babies out of the nest- they might still be eating and all, but just are not going to make it) I dont know how they know, but they do.
You had to try anyhow- what a tiny little thing she was!!!