My cats' territories

Before I headed to work this morning, I saw my large tabby, Booger, staring disconsolately at "her" sofa, where her small Munchkin "sister," Scarlett peacefully slept. Now, although Booger is about twice Scarlett's size, she will often back down during any confrontations. This time, however, she took back some of her own, and went over to sit on Scarlett's scratch pad. Could she be slowly, but surely, getting bolder?