First of all she is realy beautiful. But I do not think this is a quarter horse. She is more look like a mustang or something similarly, becouse of her legs
She doesn't look baroque enough to be a Kiger, her face and neck don't look right. Definitely not foundation quarter horse, at least not a halter type, although to be honest QH's are all over the place lately. In the body she looks a lot like an Appaloosa/Quarter Horse cross grulla filly I know. She looks grade to me.