Hi OP
There is some valuable info and some misinformation on this thread. Listen to @worstofbothworlds @LittleBigHead and other academics. I'm an academic and former HoD.
So it sounds like your daughter could never have gone into Y2/ L5. That only happens in really exceptional circs. This is because to earn a degree you usually need to have passed a certain no of credits so you cannot skip a year as then you would miss those credits.
Typically tuition fees are paid in tranches, e.g. Oct Mar etc. In a former role, I would advise students to suspend or withdraw if they were unlikely to pass as that was in their best interests, and part of my advice would be based on their tuition fee liability.
As for reasonable adjustments - many students do not declare their disabilities upon application so assessing them all and putting in place RAs is not remotely possible. We encourage students to disclose but we cannot make them. Research by UCAS shows that up to 50% of students with diagnosed mental health issues do not disclose to their institution before arriving.
Then it is a question of whether the adjustments are reasonable. Some are, some aren't. It doesn't matter if presentations are only a small part of the assessment landscape if they are testing core skills. What CAN typically be done is making adjustments to how the presentation is delivered. I once had a student with selective mutism narrate a voiceover to an animated PowerPoint and play that to the class for her pres. I have also done closed shop presentations with only staff as audience members. But we don't just say skip the presentation.
OP in short, I would encourage your DD to take a break, spend 6 mos getting as well as she can / make progress with your health issues, and return fresh in Sept with less academic, health and financial pressure.
If that prospect upsets her so much that she will drop out completely and not return, then very gently, she is not right now in the right headspace to do a degree.