My boyfriend just adopted his parents' 13 year old cat about a week ago, and she was doing very well with the transition, until I came over to meet her last night and she started peeing on everything in sight. My best guess is she smells my cat on me, but I don't really know for sure if that was why. There were also a lot of people over, but not for the first time since her relocation, and she had never peed before. The only new variable was me being there. How can I help avoid this happening during future visits?