Can you make her stay inside? I'm sure there is a lot of room for them to avoid each other inside???? Also I learned the hard way not to pick sides and not to play favorites. It is soooo hard to do too!!! But they compete for which one of them is to be by my side and I have learned to pet and praise both the same and let them figure it out. I love them both but Meka is my girl but when I play favorites Max backs down and gets scratched and they do not get along. When I let them figure out what they want (for that day - it changes each day I have learned) then they get along. BUT most of all I learned to make them understand that the TOP CAT is ME!!! When they thought they ruled the house all he..... broke loose but now they play for 3rd in command behind hubby and me... That is why I asked if you can bring her inside but still give her enough room so she can escape if she wants??? Max and Meka have been forced to be together alone a lot as we have been leaving town just about every weekend and they have been home alone. I personally think this has helped a lot as they only fight about us when we are there. And I split them up taking one with me one weekend and they hated it and missed each other - Max didn't eat right at all and Meka was lonely.. So maybe it would be better if they have to be in the same place - not escape outside but still have an escape inside to go to. Besides she probably thinks the newcomer has also taken her space inside and is resentful to that too. As she has marked the house as hers and now the new one is there and she is not. Just ideas, Debbie