Leslie, Kylie does the same thing!!!
She rarely covers her poo! Last night I was going nuts with that "smell" thinking it was one of the girls farting but I scooped the box and it helped tremendously!
whew!!
I think Kylie is getting a new cat box for Christmas.
I also installed a "pet door" My dad built me a closet last winter and I had them cut out an arc so that I could put the litter box in my closet. It works great!! Except for if she gets stinky and I have to febreze my clothes just in case!!!