Re: Lip numbness
First glance, this sounds like an embouchre problem, perhaps. Though the bottom lip is between the teeth and mpc, it's actually supposed to be more BEHIND the bottom lip - not directly under it. It requires building up the lower lip muscles to manage this - exercises in Larry Teal's "Art of Saxophone" book help somewhat. This can help tone control as well.
Some people have dental inserts made which a player places on top of their bottom teeth (only when playing - I'm not talking surgery) to "round the edge" of the lower teeth. This is really a band-aid of sorts - it's better to do things right, though I can se how a person that plays for many hours may develop numbness even with a good embouchre. Everyone's physiology is different, so the solution for your daughter may not be the exact solution that works for me.
She should consult with a professor on this very soon.