I have had her part time for about a year and she has been quite challenging for most of that time, tho has (had!) improved loads...but now she goes ballistic when challenged or asked to do something she doesnt want to do and will hit me. I use time out, but she screams and kicks the door, then eventually emerges with a scowl that would freeze your blood, and will kick off again soon after. She seems so angry. What can I do to help her (and me!)?