It's obvious that she does NOT like the play fighting, so your husband needs to stop. Karen is right, the kitten may be a good thing for Lucy. It'll divert her attitude towards your husband. She might just be lonely. When you pay attention to the kitten, also pay attention to Lucy, giving them both treats so she associates it with a good, enjoyable thing.

Thank you for not giving up on Lucy. She just needs a little extra attention to let her know she's loved and special.