Sorry to hear Sam. We went through something very similar with my wife's grandmother several years back... She was already in assisted living but was able to get around pretty well on her own and still cooked and did everything in her apartment, but then fell and broke her hip, and after that was never able to get back out of a wheelchair, and the anesthesia just accelerated her dimensia and alzheimers like unbelievably, and it wasn't long after that we lost her. It's crazy how something like that can affect the elderly (assuming she was?)
My thoughts and prayers are with you and your family... Don't forget to celebrate her life and not to mourn your loss...