DD made a new friend who is a lovely girl but lived close by to one of the abusers. Through this friendship she met the groomers who professed initially to being her boyfriend (stop was immediately put to this). This group freely offered drugs, alcohol, a free house to party in and eventually sex.
I only found out the extent when the school contacted me to ask why DD had not been in school for a week... The girls were being dropped off at school by their parents and promptly collected by the groomers 5 mins later, returning home as normal. This escalated to DD jumping out of windows, running away, brazenly walking out of school, stealing, lying continuously. It went on for about a year. We were completely powerless but kept on fighting. At one point we were prepared to send her to boarding school to get her out of the area.
We forced SS involvement, they appeared, took one look at our family set-up and declared themselves all out of ideas. We reported her missing to the police every single time she failed to come home from school, resulting in our house being searched every night. We forced SS to take her into care over one weekend after she had stolen money from her blind grandmother. We pressed charges against her for this too. We worked with the school, dropping her early and handing her over to guidance, collecting her early after school at every day. We changed schools, she absconded again on the seond day...
We got DD involved with a local charity SafeSpace who were brilliant. We talked and talked and talked....
The police were useless, the groomers were warned but not charged.
The only thing that worked was DD growing up and realising that her/their behaviour was disgusting. I thank God that she did.