I use World's Best, and even with 5 cats it does very well. But the type of litter isn't the main thing, it's how clean *you* keep it. You have to scoop at least daily -- if your mom is prone to coronaries, then twice a day!
There are also some products you can sprinkle into the litter to keep the odor down; you might want to check at Petco or Petsmart for those.
Jean Hofve, DVM
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