There's this stuff called "Nature's Miracle" that you can use. Also, I suggest that to re-train the kitty you lock her in the bathroom w/ her litterbox at night for about 10 (or more) days -- if she does it again then repeat this. I know it sounds mean, but it's not. She needs to get re-programmed and that's how to do it. It will really work if you stick to it!
Final suggestion, don't fill litterbox all the way. Just put in a few cups and change it every night until this behavior goes away. Don't give up on her, they can definitely be re-trained w/some patience and persistence. You did a good thing, and good luck to ya.
Sprite
"I call it reveling in natures finest element. Water in its pristine form. Straight from the heavens. We bathe in it, rejoicing in the fullest." --BZ
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