100 year old Mother with aspiration pneumonia. If she comes through, will her quality of life be even less?

My 100 year old mother was admitted to the hospital with sepsis, aspiration pneumonia, and kidney injury. She's been on IV fluids with IV antibiotics until yesterday when all her numbers had returned to normal regarding her white cell blood count and kidney function. They then switched her to oral antibiotics and took her off the IV fluides. The pnuemonia is still very much the main concern. The cough is constant and makes it difficult for her to rest. Through yesterday they were giving her a cough syrup that had a narcotic in it which seemed to help. But suddenly yesterday and last night she started getting very agitated, fidgeting and seeing things that weren't there, would say things that made no sense, and didn't recognize me. She does have dementia but yesterday she was totally not herself. She's had very little quality of life for the past year and a half. Now my main concern is that if she comes through this, will her quality of life be even less? And how long will she possibly last, going back to a skilled nursing facility where she'll most likely have something like this happen again.