I give mine to our street neighbors by conducting an egg run. It’s surprising what I get back in return - pineapple upside down cake, lemon slices and hamburger meat. The barter system is a wonderful tool.
I had a similar problem - predator and introduction of new hen. I've heard it said that if you introduce the hen at night, your two hens would accept her as part of the flock. You are obviously past this and I didn't know that tip. My poor new hen got beat up pretty bad but one thing that helped...