Im not any expert, but I was at that level earlier this summer and really no ski would have fixed it. It looks like a combination of her being on her back foot, not bringing her hips up, and like my wife, not really *trying* very hard ( don't take this personally), although if she fixes the first two she will have a lot easier time of things and wont need to try so hard. Also she is definitely at the level she should be using one hand in her turns, it helped me a TON and I started doing it before I was that good I would say.