DD's college seem to be quite concerned here and I'm actually really worried now. DD's behaviour was absolutely horrendous, words such as "I wish you were dead" and "you're a cunt" were thrown around and I just couldn't bare to have her here. She refused to stay out of my sight and so I told her to get out, she then said well where am I supposed to go? And I said I didn't care and for her to just get out, she left. It hit around 9pm and it was getting dark, I told elder sister to suggest she could go stay in her flat... eldest sister texted her and said she could go stay there (eldest is visiting) so DD did. DD didn't know it was my suggestion, but I knew she was safe and told the college this. But apparently they're still concerned and were blabbering in about how I have parental responsibility... she is 17 for gods sake! AIBu?