Well, although I do think that a blind bird could learn a largish environment as long as nothing is ever moved around, if she only flies two or three times a month and only when she is overly excited, that will not give her enough 'practice'.
I still think that a mate would benefit her greatly. I've had several handicapped birds and all of them did great with mates. I had two budgies (brother and sister) that had their legs so splayed that they would actually lie on their chest and belly with their legs up in the air in the shape of a V, they both had mates and never had a problem (they had found the way to perch by grabbing the bars of two sides of a cage, right at the corner). I had a bird that had a leg shorter than the other and her mate would perch on her 'short' side so she could lean her body against his side and he would stand there, holding part of her weight, for hours and hours. I had a male lovebird that had been starved and ended up with such severe chronic stargazing that he could only eat if things were hanged from the top of his cage and he still managed to woo and keep a mate. I had an amazon hen that had such large cholesterol deposits in her eyes that she, literally, only had peripheral vision, and her mate, as old as she was, had severe arthritis in his toes and feet and could not perch properly but they still loved each other and spent every second together. Nature ordained that parrots have mates and made it so they love each other so much that their lives are not completely fulfilled unless they do so, even when they have disabilities, this directive is too strong to ignore in terms of quality of life -especially with aviary species that never really mate bond with humans.