If the cat is urinating more than usual it could be diabetes,urinary tract infection,or even kidney stones.Do you see blood in her urine or stool.If the cat box is saturated with urine ,you should take her to the vet because this can be serious,and may be fatal if not treated.If you suspect worms take a sample to your vet and ask the tech to run a fecal for parasites,and if it is positive they can sell you dewormer to treat her.Does your cat ever cough up hairballs? This could also cause digestive problems,as can switching foods.