That is a foal if I ever seen one! What was the colt? Sorry you have to find out this way but she looks like she has been well cared for and not missed a meal or a good grooming. Baby should be fine. Just a day or two before she foals she will bag up and stand funny, back legs slighly apart and behind. Being a seasoned mare she should foal just fine, but have a vet on call and the necessary items ready. ( foaling kit)
Heheheh, send a request for " child support" to the colts owner.
Anyways tonight I felt it kick my hand after pressing on my mares belly after she had her tea and nope I go without and my two horses get everything :)
I will keep you all posted