My father died in 1986. I'll see if he can spare a minute.
In one review of 500 patients who suffered nontraumatic, anoxic brain injury (excluding drug-induced coma), 16 percent of patients had a good recovery or were left with a moderate disability, 11 percent of patients were left with severe disability, and the remaining 73 percent never improved beyond a vegetative state. Of the patients who remained in a coma at 1 week, 7 percent improved to a good recovery or moderate disability. NONE of the patients who were comatose at 2 weeks improved beyond severe disability.
How long has in been since her anoxic event?
source: Levy, DE, Bates, D, Caronna, JJ, et al. Prognosis in nontraumatic coma. Ann Intern Med 1981; 94:293.