If you can get her some intensive Maths coaching at a facility (or with a tutor) skilled in helping kids with executive function issues, it might bring her average up.
With difficult child 3, we have had to drop his subject load back to part-part-time. That seems to also be helping. It is increasingly looking like the citalopram was the problem (still is - we're weaning off). I asked him last night how he was feeling, he said he was ok, not too stressed but he is feeling like his head is not so fuzzy.
The partial load plus work to fill in, could be the best way to go. And if she can't get her grades up enough - then she can go back to it after a year or so's break. Is thee a part-time option for her, with school? You might need to ask. We have that option here.
Marg