Mmmm, sure is a cute little thing. You know I really can't make up my mind on this one, if she checks out OK, should blindness be a death sentence? I'm not it it should, she wont be stressed about it, this is her normality, she will grow up coping with her reality. Maybe it will work out fine, maybe it wont, but I'm thinking that I would give her a chance, see what happens.
Very bad quality video of blind horse in Cowboy challange
Better video of blind 2nd level dressage horse.
Think in terms of what she CAN do, not what she can't.