She left now and will continue to do it later on in life, lay down the rules now and tell her your not playing this game.
Give her the space, pack up her stuff and drop it off at her couch.
Going rouge means she wants to leave since she isn't with you trying to figure her life out.
This is the exact thing I've been thinking, when I was down or had problems I always turned to her. And she's come to me too.