Urinating on my paperwork, clothes, purses, backpacks and pooping by front and...

[Charley]

...back door? I have a cat "Artemis" that is 4 years old, she is in perfect health but consistently urinates on my paperwork (for work and school) urinates on my clothes, laundry, my son's clothes, my shoes, my purses, my backpack, briefcase, and now the furniture. She has also started pooping by the front and back door. I have Zeus and Adonis (male cats) everyone is fixed the boys don't do it only her. I have 4 litter boxes, I have tried different litters. The litter boxes I empty daily, she can get to all of them. My 7 year old son's asthma goes through the roof because of the smell of cat piss. I am scrubbing everyday, and she has ruined close to $3000 dollars worth of items as well as embarrassed me at work and school with the scent of urine, I own a beautiful home that is paid off, in a desirable neighborhood, I have no mortgage, now my home is being destroyed, she also urinates on my kitchen table where my son and I eat. She has climbing toys as well as toys to play with, I don't know what to do. I am thoroughly disgusted and at my wits end! Please help I don't want to have her destroyed, but my son comes first. I have merry maids once a week and I scrub something EVERY DAY, I am out of time and my patience is thin and wearing.