If she lost it at GCSE is she trying to compensate by taking on so much a A level, to try and prove it to herself and other people?
If so (which it really seems like) she isn't super-human, super-human would get straight A*s with a mental break down and doing that much and 6 AS levels is gunna muck up her chances with medicine, if she REALLY wants to do it then she would get amazing AS grades, with very high unit grades and secure her place
although none of what i say will probably make a difference, in a years time she will kick herself
also one year isn't that long to figure out that you have taken on too much, so DROP IT NOW!