I thought I'd give an update on how Gidgy's doing. She's quite blind now, and can barely see anything. She's still finding food and water all right, and somehow can get into a nesting box. Her method of getting on the roost is kind of scary though, she just flies straight into the air and hopes she lands on it. She generally makes it, but sometimes lands on another chicken, which is quite hilarious. I'm thinking of making it lower, so it'll be easier for her and also for my heavier hens to get up and down from.
Honestly, this little hen is still loving life. She's a happy little chicken, always the first to greet me in the morning, and loves to perch on my foot. I only let her free range while I'm out there watching, because I'm afraid if a hawk came, she wouldn't see it. The rooster gives quite the warning, but she just freezes wherever she is.
Anyway, thank you for the help of everyone who replied here, and I hope my experience can help someone else.