Except her healing factor SHOULD prevent her from developing that sort of dependence.
However uncomfortable it is, the prostitute angle works because of how it fits into the cycle of domination and abuse that defined her early life. She's abused, controlled, and maltreated by the Facility, leading her to a state where she's unable to recognize she has agency, or even a sense of self. She succumbs to Zebra Daddy because he preys on and utilizes that exact lack of agency to gain control over his victims.