Hi. We have just (only yesterday) adopted the sister to a male kitten that is about 5 months old. They are both 5 months and the female joined us yesterday the male has been with us a while. So far the female has peed twice on the floor and just pood on the sofa. When we got her we were told she had started peeing outside of the litter tray having previously been trained. Any advice? I know it's all still settling in. I keep showing her the litter tray etc