welcome to HealthcareMagic forum!!!
Your aunt must ve suffered from a stroke
by what i understand by your description of "cerebral attack", but if she is in coma
now, the reason for her to go into coma at that time can be due to many different reasons like electrolyte disturbances, very low or very high blood sugar levels, very low blood oxygen
levels, a bleed into brain or diminished blood supply to vital centers in the brain. Since there are many causes for one to go to coma, so are the treatment options depending upon the cause. But if a person is in coma for a significant period of time it might not be due to correctable causes, and as Dr Rakesh Madhyastha said if has hypoxic ischemic encephalopathy
, i am afraid she doesn't ve a many treatment options except supportive care and some neuroprotective agents. Wishing your aunt a quick recovery.