I should be clear, she's mean to me while she's my daughter's favorite. I caught them sunbathing together on the grass yesterday - hen asleep, laying on my kid's belly.
While I agree with you that many times this is the practical solution, some people love their chickens as individuals and see them as pets, and so look for solutions to save them if they are ill, or try to solve a problem in order to keep the problematic bird. In this case, the OP has her daughter to consider.Seriously - just get rid of a bird that no longer fits the flock. If you keep them, they wind up ruining the whole chicken experience. There is little you can really do to stop behavior in a chicken. Sell or cull, and you will enjoy your flock again. You will be amazed at how much happier you are without the problem.