Broch, the loss of eyesight isn't as bad as you would think with a dog.
Dogs eyesight isn't particularly good, they pickup motion colour and light, but they don't have very good detailed vision.
A dogs sense of smell on the other hand is far more important, they get far more information through their noses than they do through their eyes. It's believed that a dogs olfactory bulb is 40 times larger than it is in humans and that they have between 220 and 300 million scent receptors in their noses. Judging by the smell of some of the people I came across the other day that's possibly 219 million more than some humans.
It's surmised that in importance sight comes probably fourth in line for dogs with smell being the primary, touch being the secondary and hearing being the tertiary senses. Taste comes after sight, but it does also effect and have relevance to smell.
So chin up mate, she should be fine.