Lucy is attacking her tail

[crazycatowner]

I ment konagirl, not stephanie

[Catty1]

If it is a stress reaction - to the new baby (congratulations!) - often Rescue Remedy or Feliway can reduce the stress and the actions.

Have you checked her tail to see if anything is on it? A sore or something?

How old is she?

A vet should be able to help you figure this out.