Update: I put the chicken saddle on the chicken and she hates it. I did it late last evening just before they roosted for the night. This morning she was in the nesting box. After laying her egg she just ran and ran and ran and ran all over the yard. She runs to Harvey, the rooster but he just runs from her, as do the other chickens. I'll give her today, but if she doesn't calm down I'll have to take it off of her. She is disturbing all the other hens, making them run as well and I can see egg production falling away! This does not seem to be working.
View attachment 1691618

She will get used to it. Does it fit o.k. under the wings, no pinching?