HELP my cat won't pee in her litter box!

My cat has always had some issues with the litter box.  If it wasn't clean enough for her she would stand on the edge and pee outside the box.  So I make sure that it is cleaned daily.  Then she moved to peeing on the floor beside her box.  Next i noticed that there wasn't anything to scoop for a day or so!  then I started to smell the horrible odor!  I have discovered that she has been peeing in various spots on the carpet in the family room which she should be walking through on the way to her box.  She has in peed in front of the sofa, behind the sofa, around the edge of the room. 

I have had her checked by the vet,  added boxes, changed the type of litter, cleaned the spots I can find with enzymatic cleaners.  She will now go in the box once or twice a day but then I think she is continuing to pee where I can't find it because my basement family room smells like a cat box!  

So I have made a room divider out of window screens to block her access to the family room but I am afraid she'll just pee somewhere else.

I don't know what else to do!  I don't want to find a new home for her, she is my daughter's cat and she loves her.  But I can't allow her to use my house as a toilet wherever she wants.

I don't think your cat had issues to start with, you didn't realise you needed to clean the litter box out every day.

Personally, when I'm home I clean my litter boxes after my cats use them and when I'm working I make sure they are clean before I go to work and before I go to bed.  

When your cat stood on the edge of the litter box and peed she was telling you that she wasn't happy, then she found cleaner places to go to the toilet and now it's become habitual. 

I would get a black light and find out where she peed and clean it with the enzymatic cleaner.

Here's an article where experts give their tips.

I think you were on to the right idea when you added the extra boxes. 

Here's an article on the best places to put the boxes. 

If you are in the US you could try cat attract, it comes in litter or in containers which you spread over your own clumping litter and is sold at amazon. 

There are other things you could try also, please keep us updated so we can help you work this out. 

I second Cat Attract - HERE. It solved our cat's litter box issues. Before Cat Attract, we had four different types of litter boxes with all different types of litter scattered all over the house. For months we watched her and the boxes to see which box, litter and location she liked best. There was a lot of trial and error, but once we found out the magic combo with the location, we were able to remove all but one box.

Put the Cat Attract in different boxes and set them down in the spots where she pees. Also, make sure the boxes are large enough for them to freely turn around. Our cat avoided the little boxes that she couldn't turn around easily in. And someone has to scoop every time after she uses the box. if it's a clump of her pee, she will dig and dig and bury that old clump extremely well before she goes to another spot in the box to pee again. But if there's poop in her box, she will not return to it at all until the poops been removed. I don't blame her. As I've said time and time again, if I went to use the toilet, and I saw a big turd in there that I couldn't remove, I wouldn't use that toilet either. Ha!