Ofcourse it is possible that Afia Siddiqui is having mental problems because of some family condition. We have Khehkeshan's diagnosis to go on there. or it could be the rape and torture that american prisons have come to be associated with, and that has been reported specifically for this woman. both are possibilities, but perhaps Khehkeshan can tell us what enables him to say it just happened like it just happens?
I can only speak for her family history as I know that much - I don't know what happened or did not happen to her in any prison or when she was really arrested.