You may have just preemptively saved this struggling childs life. Feel greatful if she makes it and works all this out on her own while she has time to get away. You may have also unlocked a new passion in her to be outdoors and do life a little differently than what the rest of the world expects out of us.

Ultimately if it doesn't work out for her it's still not your fault "for not doing more" or whatever other guilt you may face in this time. Her life issues weren't your fault, nor are you responsible for her response in how she attempted to escape from it. All you did was attempt to give her tools to make it easier on her if she finds herself in a situation that she needs those tools.