Aw, I hope things get better for your friend. If anything she certainly could re sit modules next year so if that's the only module she's missed, she could re-sit that one module then explain to universities what happened if she decides to reapply for next years set. She won't have to re-sit everything unlike the new A level where students in this position would have to sit the AS and A2 modules again even if they sat and did well in the others. The new A levels is much like the current Cambridge Internationals (CIE) format without November resits. Overall, she'll be ok.