No direct experience, but I think the others are correct, dogs adjust well to blindness.
I did meet someone who had a little blind mutt, it was actually born that way. Since it didn't know anything else, it apparently did very well getting around; the other senses compensated. I'll bet your Collie will be fine, once she gets used to being sightless.
PS I love her name.
My name is Carina and I am a Starbucksoholic.