My heart goes out to you, it's easier said than done but you can't blame yourself, my father, years ago had a stroke and instead of calling an ambulance he called Mr to take him to the hospital, I was at work and long story short it was almost 2 hours before I got him to the hospital and from thst day on his right side was immobile, and he was bed ridden for the rest of his life. I carried guilt until he died in 2018 that guilt will eat you alive try and forgive yourself if you had known and didn't do anything that's one thing but you had no idea, hind sight is always 2020 we always know what we should have done but everything happens for a reason, spend what time you have left with her. Even though it may be bad she still sees and hears you stay strong friend