Two times a day is better than once or none, but I scoop mine much more often, whenever someone goes if possible. Cats are extremely clean; some just won't go in the box if there is anything in there at all. Maybe she needs to clean more often. And if the litter is soiled at all, change it out completely after cleaning the box with hot soapy water (and I use some pine disinfectant in it, or bleach, making sure the box is completely dry before letting the cats near it, and filling it with clean litter). btw, the enzymatic cleaners (I use Nature's Miracle Just For Cats, available at Petco, PetsMart, and other "pet" supply stores) do a great job, when used as directed, of not only removing the stain and neutralizing the odor, they actually "eat" the contaminant using enzymes, so the area becomes clean. And for "accidents" on carpeting, the home-use shampooers can be wonderful -- and they pay for themselves in time!