32” high & 100 pounds is about the size of a pretty good sized dog. It sounds strange, but it might not be that big of a deal.
Still, maybe she should find a place to live that might have more room - for the little horse’s sake.
The pony needs to be house trained, that’s for sure. However, the smell from poop is stronger than a dog’s. And if you let in a pony, what next? Lions, and tigers and bears, oh my!