I'm a little late to this thread, but I wanted to say I'm so sorry about your daughter's situation, HK. That's tough, and it must be even more stressful with no clear steps to take.

I'm by no means qualified to answer, but do you think maybe she could split tests/exams up into smaller chunks? For example, if she can manage for, say, 30 minutes consistently or at least usually, perhaps she could just go 30 minutes at a time (or just stop whenever she has a problem and resume) until she reaches the time she'd normally have.
Even if they were somehow worried about her having too much time to study or cheating or something (which seems absurd to me, but you never know), she could go part-by-part and do maybe 5 questions at a time.