judging by the ears I would bet my last dollar that one of her parents had pointed ears like a shepherd, or possibly a shepherd cross. since the dog likes to point and is mostly liver I would say your right in guessing she is one part GSP. however the pointing instinct can pop up many non sporting breeds.
if your goal is to get her to point birds for hunting, then you should get her into some training birds. every time she successfully point a bird she gets a reward every time she flushes she gets a talking to.