Like other posters, I'm truly sorry this happened to you.
You state that you don't think you can keep chickens again. This is a normal reaction to losing almost an entire flock. I hope you change your mind. The one remaining hen would probably appreciate companionship, as chickens are flock animals, and are happiest when they are not alone. Also, you sound like a caring and loving chicken person. Any chickens owned by you will be lucky birds indeed.