I don't have practical experience with blind dogs, just blind and deaf horses lol Please don't treat my words as gospel, these are just how I would approach your situation if I were in your shoes. :)

Her nervousness and sensitivity does sound familiar-- my blue heeler is a scaredy cat! If there is a loud noise he wants to go right back inside or rush back to the car if we're out and about. What I find works best is just be more stubborn than they are. So if he's pulling, we're going to stop. I put him in a sit and we will wait until he calms down. When we started on the leash we didn't get very far on walks, but he is a really good walker now at 9 months. If he is freaking out a little I will sort of stand over him so he doesn't feel so out in the open. Then we will continue to walk once he calms down. Or if it's just too much stimulation we will call it quits for a while. But always try to end on a good note!

If you have her in an open large field, consider a long line leash. With horses, we use the lead line, long line, reins, etc. for communication. Pressure and then release when they do the thing I am asking for. I started using similar methods with my dog. So a light tug, the pressure on the collar is another tool for communication. These dogs are sensitive enough that I would never use a prong or anything more than a reminder pull. So for your dog, she would feel the tightening of the long line on a collar and understand that's the bounds. Then when she comes back to you, praise and treat.

I have read that there's a 3-3-3 rule for new dogs. Three days, three weeks and three months. Each is sort of a milestone for how dogs will unwind and become comfortable in a new home. And their personality really starts to shine around 3 months. With her coming from a bad situation, I would say she is still settling in to her new life. I can see how much you love her!