Is there any chance that in the end, she can just live with your mum? with my calico, she never did stop hitting tuva, like I said, he learned to avoid it, but a cat such as a tortie or another calico may choose not to avoid but instead to confront, thus a never ending confrontation. I don't know for sure!!! Anybody out there know what happens with 2 calicos or torties that are not liking each other!? jen- they CAN learn to get along? With just the 2 in the house?