Are you able to take her to the vet? It would be good to know for sure what is happening and if there is anything going on that could be treatable.
I have a friend who has a cat that is blind and she makes a point of never re-arranging the furniture because her cat is very used to where things are and uses each chair leg and sofa corner as markers to gauge where she's at.
Her house isn't that big so that helps. If you live in a big home, you may want to make her living space smaller so it's not overwhelming for her.
I'm sure she would need extra reassurances from you now, more than ever so it sure couldn't hurt to snuggle and hold her alot.