Poor old girl... and poor you.
From 14 years old our Betty's cataracts got worse and worse, and at the same time her hearing failed progressively with her eventually becoming completely deaf on one side and only having 10% hearing on the other . Its very sad to see this happen to someone you love.
We were lucky. Our girl just took it stoically and didn't let it upset her, nor did it stop her from running free on both well-trodden and new walks. Fortunately she has still enough sight left to workout basic landscape outlines, and her sense of smell remained intact so she always found her way back to us....eventually. There were many funny times when she would go off, get lost and then take 20 minutes happily bombing up and down tracks looking for us by scent, often charging past just yards from us completely oblivious to our presence. The secret was to stay still and quiet and wait for her to find us, which she always did. We're convinced that in her dog brain she reconstructed the situation to it having been us who'd gone off and got lost, and her who'd found us!
Hoping your old girl learns to live with the isolation and find new ways to interact with you.