I am sure the chicken will have a good quality of life! I have my own chicken that sounds just like yours, and she is my favourite hen in my flock
. I choose 3 white pullets form a store. One was much smaller than the others and was very tame, pecking my hand a lot and cheeping to be picked up! So I chose her. I should have though why she was so small
It became clear that she was acting strange. She was always following my so close, like I was her mother. Getting under my feet. She loved to climb onto my arm or hand and sit in my hand. All the others grew fast and reached adult size, but she grew so slowly and is still small, but very heavy!
Her eyes look perfect, clear and bright, but I think she is more or less blind. She can see big things like me, and she follows the big rooster everywhere like glue. She is the only hen never to use the roost, she can't see it. So I put her up every night.
Like yours she can not see the treats or small things on the ground or in my hand. She can see the big red feeder and shoves her head into the feed, rather than pecking at it. Also the water, she dunks her head under the water to drink, or else totally misses the top!
But I know she is very happy. All the other chickens and roosters are sweet to her. She still loves to run after me and try to climb on my foot. She never seem to bang into things and can find her way about easily.
The only sad thing is she has never had the pleasure of tasting my meal worms as she can not see them!
She is so funny as she is not frightened by anything. like to follow my dog about and peck at him when he is trying to sleep! Also she likes to stay out late in the coop and walks about, pecking and acting like a normal chicken well after dark if I am late to put her to bed.
So don't worry and enjoy! Just make sure she can get enough to eat and drink and she'll be fine.