Hooker or not?

I went to visit someone in senior housing. As I was going into the building a car pulled up and a very pretty young lady dressed in sexy clothes got out of a car driven by a guy who waited in the car. I rode the elevator up with her. She left about 45 minutes later, getting back into the car that had waited. I think she was a hooker. The person I went into the building with said no way. What do you think?