The thing that jumped out (besides her beauty) is that she looks like a QH in the first pic. She looks to have some arab in her,too. Maybe a QH/arabian cross?
My neighbor has a QH that I could swear is an Arab,though. Dishy, refined face, but he is a purebred QH. :)
She could be a Polish bred Arab. They often don't look very typey. Take Lacey, for instance, she has a kinda Arab head but her body is definitely more muscular and "heavy duty" looking like this mare.
My first guess would be full Polish Arab, but I'm also not against Arab/QH. Haha