Litter Box Diva

So my sister Greta is what I like to call, "a Litter Box Diva." She likes to sit there and stare at me until I am done with my business. I am like..."Greta go away, give me some privacy!" And when mom cleans the litter box she sits there just waiting to "go." Half the time she does not even wait for mom to finish. I don't think I have gotten to go potty in a perfect litter box since she got here. She is sure a litter box hog too! God forbid we both take a litter box and go at the same time! She is always scooching towards me when she is in the other one, so much so I accidentally get poop or pee on the side of the box. And of course, she only does this when mom and dad are at work. And I feel so embarrassed when mom sees the aftermath. Greta! What a Litter Box Diva!