GREEN + GREEN = BLACK AND BLUE
I strongly suggest you either 1) sell the horse and buy something that is better suited for you 2) don't ride your horse until she's had a good solid 60 or 90 days with a trainer, and no longer has this issue 3) take lessons with your trainer and ride the horse while be supervised.
An inexperienced rider with an inexperienced horse often ends in disaster. What if Squaw DOES unseat you, and you fall and hit your head, and end up with hospital bills from a concussion? It could happen. Or when you fall off, she could step on you and break ribs. Or you could break an arm when you fall and are trying to catch yourself. Any number of things could happen. And we don't want those things to happen; that's why we are trying to warn you. We don't want you getting hurt.
Either way, I do not agree with Breezy's advice. You should not try to tackle this on your own. There's a time and a place to experiment with training a horse yourself, but this isn't one of them.
Its certainly most likely that you are cueing Squaw wrong for the lope (hanging on her face, tensing up, accidentally bumping her with your legs, etc) and also that she knows you aren't experienced enough to do it (horses are indeed smart. They know who they can get away with) and/or the fact that she is just plain young and doesn't know what she is doing yet. She might not even know that bucking is wrong under saddle.
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.