The PTSD Survival Guide for Teens was written by a trauma specialist and her own teen daughter, and it reads like it, practical skills for flashbacks, nightmares, and shaken trust in other people rather than a clinical lecture. It mixes cognitive behavioral, dialectical behavior, and acceptance based techniques into short, workable sections. The paperback is currently out of print, so the real option right now is the ebook at about eleven dollars, no account needed beyond the purchase. It is not a crisis line and will not replace a therapist, but it gives you something concrete to do between now and finding one.