Vancouver guy. Runner and adventurer.
That’s a difficult situation, and unfortunately I’m not qualified to deal with that and neither are you, so don’t feel that it is your responsibility to help your friend out of this state. You can offer positive support, however that may not be enough and if your friend is endangering herself through her behaviour then she needs to seek help from someone who is qualified to help her. Urge her to go to a counsellor, doctor or to notify her parents that is is going on.