I like a lot of these suggestions. I have worked with 2 1/2 blind horses. Each lost one eye completely for different reasons, both where children's horse and completely bomb proof, though one needed a red ribbon in her Tail. Pixie had a tendancy to kick if others got too close.
Carmen It sounds like you have a good base with her, I say keep going! Just know it may take a little linger for some things now and remember that your cues must now be verbal instead of body language. You still don't want to over due it with the noise but simple verbal cues.
I think patients and time and you'll get her under saddle and I'll bet, if done right, she'll be one of the best horses you've ever had because she will trust you so fully out of need. The only thing I see being a problem is I would think it leaves little room for error. If you accidentally lead her into a wall she may loose trust rather than gaining it.
I like Smorbs idea of a verbal cue when you saddle/halter/etc.
"It's a lot like nuts and bolts - if the rider's nuts, the horse bolts!" ~Nicholas Evans