The "safety reasons" I read in another article were that:
"St. Jude does not have any elevators, which means students have to travel up and down stairs to get to class. Mitchell said Cosby tore her anterior cruciate ligament, or ACL, in her knee last year and had also experienced morning sickness a few times during class."
Long before she was pregnant, she hurt her ankle and was on crutches. Big deal.
Morning sickness is LONG over.