let her have her space in the basement, but leave the door open. If there are fights, let them have at it, get some feliaway plug ins for temper tantrum easing, they are not cheap. But they do work, my 3 , 2 boys are large and the little girl is small, she hates one male as he bites her to get his way, his previous owner had him declawed, She is the sweetest thing, but all of a sudden she stays up front and the boys stay in my bed, found tooth bite son her. she hisses and bats at him, but when he bites, she runs and keeps to herself. keep a bottle of spray water on hand to disclipine. the plugins are at petsmart or petco