With that kitten energy there’s not much beyond time and experience that will change his behavior. I do think it’s good if she has a place to get away from him if she’s fed up though, the collar activated cat door may be a good solution. I know PetSafe makes one that works very well: https://www.amazon.com/PetSafe-Electronic-SmartDoor-Automatic-Activated/dp/B000WJ0IFQ