looking back i myself was a bit like your daughter, at that age i thought i knew everything and wanted to move in with my boyfriend, nothing was going to stop me. Anyway i did, much to the dismay of my parents and i didnt contact, let them know where i was living or anything, it must of been awful for them! Well i found out the grass isint always greener on the other side and we struggled with rent, food and all other household costs, in the end we were evicted from our flat. The point im trying to get across is that your daughter will see this too a more than likely come crawling back with her tail between her legs, if shes staying with friends at the moment at some point they will get sick of her and ask her to leave. Does she have any money coming in?