@pacificnwgal -It would be helpful to have a little more context. For instance, if your daughter drops AP Physics, can she go into a regular physics class? If not, would she have no other science this year? How about math … what math (if any) is she taking now? And how selective are the colleges on her list?
Obviously, the most important consideration is your daughter’s mental health. And it sounds like the AP Physics class is a killer and would probably put a damper on her entire senior year if she stays in it. Since she’s already being tutored and getting extra after-school help, it doesn’t sound promising that her grades will improve.
What does she WANT to do? If she wants to drop out, that’s probably the wise move, though I could advise you more responsibly if I knew a bit more about the rest of her course load and her college goals.