I just saw this. I'm sorry to hear about these troubles. If I can offer some words of encouragement, though: I went through a major meltdown in my first year of university, too, and I ended up being fine. I was depressed and anxious, and coped by not eating. Everybody wanted to help and I wanted them all to fuck off. I did eventually see a counsellor I liked, and it helped, but mostly what I think was required was time.
I was taking similar courses to your daughter, but for my program, calculus WAS required, so I couldn't drop it! Somebody mentioned something about higher-level abstract thinking stills taking until your late teens to develop, and I think that's true. The math and physics concepts that were mystifying in grade 12 were suddenly clear by second year university. It's like all of a sudden, it made sense. I don't think I was trying harder; I think my brain development simply caught up.
Sounds like she's getting the help she needs, so I would continue on. Counselling can really help. It sounds like a anxiety-type response to a stressful life transition, which is very common, and will likely pass as she makes this tough transition to adulthood.