Thank you all for your help, I am keeping an eye on her. She seems to be getting better. She can now fly to the perch which is about 3 feet off the floor. She still misses food when pecking but is eating and drinking well.
Not related- I have built a coop door that opens at dawn and closes at...
1) Orphington, 4 yrs, ~4lb
2) Misses when pecking, cannot see food well, walks into things.
3) No sign of trauma.
4) At first she wouldn't move. Over 4 weeks time she now walks around and perches but seem that eyesite is bad. Not laying eggs.
5) Eating chicken feed for pullets, drinking water...