I think she needs a gap year asap.
She sounds like she is highly strung and neurotic (blames herself for things) and needs counselling.
I did biological sciences / earth sciences and we had 8 hours contact time every day, 4hours lectures, 4hours lab, weekends also were field trips etc, so yes the workload is massive. It gets worse as you go along, with essays thrown in and also lots of histology slides etc and projects, so I was working 10 hour days in uni and writing researching essays also. It was tough going: I took a gap year and learned how to pace myself, but I was still exhausted!
She needs a break and also to learn how to fail. We do our best but sometimes we wrap our kids in cottonwool and they don't know how to function in the real world. Your DD sounds like she has no resilience at all.
Maybe she needs to move out and get a waitressing job, for a year. Does she like music? Can she drive? Has she friends at all? Would she join the TA or volunteer in mountain rescue? How does she unplug? Does she swim? Do yoga?
She needs to learn resilience, and she shouldn't be in uni until she can figure out when to work and when to kick back or she'll break down. I would define her as extremely vulnerable, and she needs CBT and a different mindset before starting again next year.
Ring the uni and speak with the student counsellors and her professor. Try and arrange therapy for her if she won't budge, but as someone up thread said, she may be able to restart next year without financial penalty, and I would look into this in the first instance.