She is the eldest of 4, will be 18 in Feb and has just told me that she wants to go interrailing around Europe for about a month after she has finished her A-levels in the summer. She plans to travel alone for most or all of the journey. I've made it clear that I wouldn't be happy with this (in particular because she has rarely travelled independently before) but of course she's playing the 'I'll-be-an-adult-then' card. AIBU and if not, how can I prevent her from going? She's said that she will pay for the whole trip herself