How enviable. She is fortunate to have a friend like you.
I don't presume to have the same issues as her or to know what she feels right now.
[Even if I am an ENFP, and a currently unhealthy one]
And if there's any advice I can offer, is to ignore anyone that upon reading a brief paragraph on a forum, shouts random diagnostics such like "Bipolar! Depression! Manic! Mentally ill!" as if they were in primary school and they might get a sticker for screaming the right answer. Also, I'd like to kindly request that you resist snatching a copy of the DSM from the internet and treat it as a checklist for disorders in an attempt to categorize her behavior.
[In academic psychology, one of the first things we are taught is to avoid pseudo-diagnosis at all costs, *precisely* because it's satisfying to do so.]
It could very well be, that ENFPs and the MBTI have absolutely nothing to do with your particular problem. [If the situation is that delicate, it would be prudent to wary of your assumptions.]
Then again, you must have thought of this in advance [Warning: I over-idealize INTJs
], so chances are the above paragraphs were ignored. I also think that all that advice about "Leaving her behind" will be unproductive, because had she become a clear threat to you, your personality tendencies would have probably dismissed her a long time ago. [Then again, I don't know you.]
So my guess is, the reason you're here is to collect personal anecdotes? [I doubt you were really expecting the people on the internet to objectively fix your problem.]
Mmmmokay..
Recklessness is not totally foreign in my particular case. Landed in the hospital a few times, but if there was a general theme to my willful self-harm, was freedom [Not in the adolescent break from your parents, but freedom for and from myself]. When I was in that state of mind, every friend that approached me with advice and "don't do that"s, looked like he / she was trying to bind me, to lock me back in a normal state where I felt completely helpless. And I rejected anyone who even dared to mention idiocities like "unconditional love" or "true friendship", because I'd only ended up suspecting them even more than the others. This was done, of course, never overtly.. always with smiles, jokes, "Oh, you're right'"s, and layer after layer of lies. I don't know about the other ENFP's but I can be extremely manipulative, sometimes nearly unconsciously. [Would be times, where I caught myself going "Wow, I just twisted that entire story without realizing it! Oh well! They seemed so happy and amused with the lie, anyway!
] When some of my friends began to give up, it felt like it confirmed my assumptions of them. It also felt horrible because I wanted everyone to laugh and smile and not ruin the "fun" atmosphere.
...And..the rest is kind of really private.
Sorry for giving you a story without a happy resolution or a gentle cue into prettier ideas like ..hope and recovery.
Best of luck you and your friend.