Friends and enemies--sometimes it's hard to tell the two apart. Especially when some people seem to be both. In her bestselling book Mean Girls , Hayley DiMarco counseled teens about how to handle mean girls at school or church who were making their lives miserable. But what's a girl to do when her own friends are the ones doing those mean and hurtful things--being her BFF one day but betraying her the next? Frenemies helps girls figure it out. In...