With the amount of white she has, could she be a paint, or paint cross? I once rode a gelding with identical markings, who also had a couple very small white freckles here and there, some of which on his belly were you really couldn't see it, unless you knew it was there. He was a reg. Paint. He was quite tall at 16'2.
But the amount of white is what would make me think that it's maybe a paint.
The picture of the horse has the markings of AQHA Standards, No white leg markings above the middle of the Knee or Hock, No white Chin markings above the Corner of the Mouth, No Face markings beyond the Inside of the Eye, And with a Bellyspot the size of a Quarter or Larger that makes this horse a Croppout Quarterhorse.
She looks Paint to me. The size of her, body type, high stockings, belly spot, white face and white along side her jaw. She might have Quarter horse in her, but actually if you breed a paint and quarter horse together, it's considered a regular paint if it has color, breeding stock if no color (can sometimes be double registered AQHA and APHA). Which she does...It's minimal, but it's there.