Good morning everyone,
Don't give your mare any grain today and watch her closely. Also watch the foal for diarreha. Do you have any bran? If so, tomorrow morning feed her a bran mash. Bran, plus hot water, enough so that it's the consistancy of oatmeal and if you have it, some molasses mixed in. Check her hoofs to see if there is any heat at all in them.
Did you have a vet out after she foaled? If not, this is a good time to do it. He can check both her and the foal, give them any immunizations that they might need and check on her weight loss.
If she shows any discomfort at all, please call a vet right away.
I agree on this! Good morning!