I think Jane has a problem killing chickens, probably is attached to them all emotionally, but arent we all. I think you could offer her help to manage her flock size. Maybe offer her a lesson in how to cull and prep them for her freezer.
I think that is a great suggestion. If culling is an option, there might also be some poultry processors in your area that will butcher, bag, and prep the birds for the freezer. There is a poultry processor down the road (90 miles) from where I live that will process chickens for about $3.00 each. Because of the travel distance, that is not an option for me for only a few birds, but if I lived in that town, that certainly would be a consideration.
Butchering chickens is not rocket science, but if you have never done it, than it might be hard to try, especially if it's your own birds that you have grown attached to over the years.