It is very difficult to predict with the data given by you.
The patient's pulse rate, Blood pressure, respiratory rate
, O2 concentration in blood, liver
functions, renal function, cardiac condition have to be assessed. How far the central nervous system
involved has to be assessed. After assessing all these things only one can come to a conclusion hoe long has the patient to remain on ventilator and the chances of recovery.
Wish her a speedy recovery.