Thats got to be really tough. I hope everything goes well. Strokes are serious. On the plus side the most important thing with anyone having a stroke is to get them to a hospital and on blood-thinners ASAP. Since she was already at the hospital that at least means she got immediate attention, which is a good thing (all things considered for the situation).
I had a grandfather and step-grandfather who both had strokes. Both survived, though had some mobility effects afterwards. Ultimately they both passed, but not for many years (and a few additional strokes) afterwards. It definitely affected their quality of life, but not significantly until later on.
Grandfather had to use a walker, but it wasnt until after stroke #2 that he was wheelchair bound. Passed of old age.
Step-grandfather bounced back pretty well from the first one, wheelchair bound and had trouble talking after the second (which was a massive one). Passed of old age as well.
Obviously not the greatest situation for anyone, but stay positive about your grandma. Hopefully she makes a full recovery!
"It would imply the regeneration of mankind, if they were to become elevated enough to truly worship sticks and stones" - Henry David Thoreau