[Camille]

I have a persian(Zoe)who is almost 2yrs. Recently she has begun peeing and pooping on our bed. There are 2 large litter boxes and nothing has changed except we moved into a larger house. We have 1-3yr old himalayan and 1 other persian Zoes daughter.
They all get along great. I have noticed pee by our sliding door and wonder if Zoe is being scared by another cat outside or by her own reflection. They are indoor cats only so they know no other cats. I have seen a cat outside scratching at the window.Could this be the reason? or is she mad at us? Help!

Thanks Camille