I understand it happens. But most parents would, or definitely should be concerned with where their 13 year old daughter is and with who.
And the mother probably was, but thousands of young women get lost in the sex trade and disappear every year. It’s an overwhelming situation for the cops. The sex traffickers know how to keep their victims under the radar of the authorities.
It is estimated that there might over a million females being trafficked in the States right now.