I do know the feeling, Notnamechangeday.
So hard, isn't it?
But your dd is still so young. She has time on her side.
My dd is 24. There hasn't been a year in her life when something similar hasn't happened. Except she has been ill herself. Took 2 years to get into HE because she was falling ill at crucial times (hospitalised on audition day). Had a reaction to a viral infection year before last which damaged her brain function: took her a year to learn to walk straight again. Did I mention she is studying physical theatre?
This year she's about to graduate but is now finding that her teaching is likely to be cancelled (performing arts not in the govt's list of institutions that can stay open) and that the end-of-year show, where they find agents and sell themselves to the profession will almost certainly be cancelled.
I'm not mentioning this in some kind of race-to-the-bottom exercise. I am mentioning it because I know what it is that helps her to keep going. Yes, a lot of it is her own courage and her own determination, but there is actually one other crucial factor- and arrogant as it may sound, that factor is ME!
Knowing that there is always someone there who she can rant to (even at 2 in the morning), who will always acknowledge her fears, but who will also laugh with her, and who will always, always in the bottom of their heart believe she can win through. I often get things wrong, but I never give up. And that makes a difference. Friends come and go, but a parent who hangs in there is worth a lot.
Hang in there, all of you. Our dc may not seem to appreciate it at the time- but they do! And they will! And you will make a difference!