She needs to be taken and tested to rule out (or in) a Urinary Tract Infection (UTI). It cant be dismissed with a phone call and that answer doesnt sound like it came from a veterinary doctor.

If it's not that it could be some other medical condition, if it's not that it could be behavioural.

My guess is the obvious (a UTI)

Something else you may not realize, once a cat defacates in a spot it will keep coming back to those spots over and over again, because no matter what you do, unless you get a cleaner specifically for that, they will pee there repeatedly. It's a cycle.