What animals can eat moldy hay?

Yes, but it's highly unrecommended to feed her such hay, especially if she's pregnant and/or lactating, as it will cause her to abort her calf and/or milk production to decrease. Even if fed this hay, even to growing cattle, they quite often will choose to not eat it, but if there's nothing else to eat, they will eat it. They may get sick from it, especially if the dust gets in their nostrils and they start getting respiratory issues, and especially if that's all your feeding them.

I suggest saving that moldy hay as bedding, and switching to better hay, or be careful what animals you are feeding the hay to.