Just addressing 'over the top'. Admitted I believed her; my only issue was none were interested in life anymore, except the one. Dude at least said he tried, but you're probably right about him bullshitting.
In the end, I really had no idea what the filmmaker's intention/message might have been. Sad, pathetic lives fucked up by drugs. The end. That was my takeaway, anyway.
I think that girl/lady was headed toward serious mental illness as a matter of course, anyway, and that's what's up with her. I, too, am inclined to believe the story about her mom, though, because there's nothing unbelievable about it.
As for the guy, yeah, it was funny when he starts by saying, "Okay, here's the story...". He's got his spiel ready for anyone that will give him a few minutes to hear it.
Yeah, it is pathetic. I don't fault him, but if he's going to try to burden people with some form of guilt so they'll pay him, he should at least make it believable. And the doc-maker should learn how to ask the right questions if he wants to make an honest work. He could have taken that guy apart in about 30 seconds.