OP I’m so very sorry, this must be so hard. My DH was on a ventilator for a week after collapsing under similar circumstances, and I can only relate my own experience and what the doctors responsible for his care advised at the time.
Gently, your relative has developed bilateral pneumonia as a result of simply being on the ventilator and that’s not good. Just being on the ventilator itself is a risk because it bypasses the body’s natural defences and can introduce dangerous bacteria into the lungs.
I’m assuming they’ve done a gram stain to determine treatment, so they’ll be 100% sure that the antibiotics are appropriate. Part of the problem now is that she’s been on the ventilator for six days. That’s a long time and the longer she is on it the less likely it is that she will be successfully weaned off it even if she were to regain consciousness - because she was in a weakened state to start with, and the lung infection will have severely complicated things.
My DH was taken off the ventilator after a week. It was suggested to me that his quality of life would be nil in the very unlikely event that he regained consciousness and that it would be in his best interests to let him pass peacefully. They made it clear that it was my decision up to a point, but just as clear that in the end they would take over and make a best interests decision if I felt unable to consent.
As previous posters have suggested, you could try Martha’s law, but to me it sounds as though that would only prolong things and it may be that the best option for her is to let her pass peacefully, as hard as that is for those who love her.
From my own experience, the decision was a simple one. We had had ‘the conversation’ and promised each other that we wouldn’t let allow languishing on life support with no hope, so I knew I was doing what he would have wanted.
We weren’t allowed to be present when they took him off life support but we went straight back in when they had finished the procedure. It’s nothing like you see on medical dramas - passing isn’t immediate, dramatic, or scary. DH took about four hours, during which time all of the monitors were turned around and the curtains drawn around his bed - he was being monitored from the nurses station. The ITU nurses were on hand and very supportive. He wasn’t distressed, he just looked as though he was sleeping, breathing gradually slowed until it stopped and then a nurse came in to confirm that he had passed.
The one thing I wasn’t prepared for was being asked about organ donation. It comes very soon after passing, for obvious reasons. Again, we’d had the conversation so the decision was an easy one, and I have the comfort of knowing that he helped several people with the donations made.
They say that you don’t truly know your strengths until you need them, and I’m praying that you find the strength you need to support you through what must be a very difficult time.💐