I'm sorry to hear this. Digby is probably most likely trying to play with Jolene. I currently have 11 cats right now and only 2 of them are females. So far all of them get along pretty well except for my females. Both females really don't want anything to do with their 7 younger brothers. Many female cats are much more territorial than male cats and some just want to be the only cat. Have you tried either spraying Feliway or Comfort Zone or using the plugins? Sometimes these can really help to calm everyone down and the plugins last about 1 month. Good luck.