Sepsis/Mechanical Ventilation-Recovery Possible?

My gma ( 68 yo) was admitted to hospital Sunday after noon, dx: bilateral pneumonia. Sunday evening she was taken to CCU and put in isolative care because her lab showed her white blood count to be .6. (not a typo-- her wbc was POINT 6.) Monday evening had to be intubated and put on a respirator because she was not breathing well enough on her own. Later that evening had to have a central line inserted in her neck because her blood pressure was erratic and needed immediate medication. Tuesday, found out she had Strep B, and Wednesday, found out she had become septic. She is being seen by a CCU specialist who can't seem to find the time to return phone calls or visit with her family and my question is... what is the chance of survival and normal recovery and if a recovery is possible, how long should it take for her to show a least a small sign of improving? She has always said that she didn't want the "life sustaining" measures unless there was no doubt that she would fully recover, and the doctors simply say "it could go either way"?