Yes I agree with her, to rule out medical problems but sometimes just adding another kitty litter box will help.

I'm not sure how many cats you do have but I know my one girl cat gets really upset when the litter boxes are not cleaned out (which I do clean them everyday but for some reason they tend to use the 2 in the bathroom more than the others) and she will pee in the bathtub...(which I know is the best place she could pee) but I know I need to add another litter box in the house and that will solve the problem. I have six cats so I should have 6 litter boxes but right now I only have 4 in the house and I need to get another litter box.