www.dailymail.co.uk/health/article-...ead--Four-Doctors-makes-miracle-recovery.html
If you google brain dead patients surviving there a quite a bit with amazing stories to tell. I think it gives hope to families to see others in that position home again with their own families.
And in every such situation, they were either misdiagnosed as brain dead, or the family or reporter misunderstood and interpreted coma or persistent vegetative state to be brain death. By definition, brain death is irreversible. People occasionally wake up from comas, but no one has ever "survived" true brain death.
If BK is in fact in a medically induced coma, no diagnosis of brain death is possible, because they cannot even test for this while CNS depressing drugs are in the system.
If she is having seizures, she is probably just extremely brain damaged.
ETA: Just saw K_Z's post, so perhaps the reports of BK still being in a medically induced coma are erroneous.