Hard choices help

So I have spoke of my fur child here before. For her being an ass to angel. Well I had my son 8 days ago. And this cat has the idea a week after bringing my son home it's time to pee on everything. And yes i know when i adopted her that i committed to not abandoning her in a shelter or pound. But I cant have he pissing on all of my things I dont have time to clean it all up.my other 2 cats are just fine with everything they know how not to piss me off and they don't piss on everything so I know it's not a weird there is something new thing happening to have this happen. She is perfectly healthy. She is just peeing on everything