Why can't I run other peoples lives?

I know what's best for everyone but myself, so why can't I just be in charge of someone else's life for a while.
I have this friend, she has been my friend for longer than anyone else ever (other than my brother). She is ruining her eternity. I can't say she is ruining her life (although it is certainly a possibility) because plenty of people in this world are doing exactly what she is and they think they are just fine. I know better, and she knows better. She just doesn't care right now.
I taught the Gospel of Jesus Christ side by side with this girl. We studied and prayed and struggled together to teach people we cared about why they shouldn't do the things that the world sees as ok. And now she has not just slipped into these things gradually or unknowingly she has jumped with both feet. I would never in a million years be judge her for I myself have struggled and slipped on occasion. But I hurt for her like a parent for a wayward child. If you read my post about teenagers you know how I feel about this. I have too many Sisters that have gone down this path I'm not sure I can handle one more.
I suppose since I can't run other people's lives I will just add one more person to my prayers.

Getting Our Priorities straight

My Husband and I recently took a trip to Las Vegas, and while I've always known the people in this country have their priorities very askew. Nothing will re-enforce this knowledge than a few minutes in a multi-billion dollar casino. It has always bothered me to see how much people (myself included) are willing to pay for entertainment. And how little people want to get involved in their children's education or anything else. One hotel/casino in this case The Aladdin cost $1.02 billion to build and I can't even guess how much money they take in in a day. I've seen people throw away as much as $5,000 all at once and not even blink.
Now I'm not supporting communism or anything but I understand the ideal behind it. The problem is people seem to need someone to tell them what to do. In the case of all the attempts at communism throughout history that person has turned into a dictator. In the case of our country right now, Hollywood and the media seems to be our dictator, and many are following.
My point is (if I have one) if the money from one hotel/casino or one big budget movie (including the money these things would take in) were put into the school system, or into making affordable housing for those of us that can't afford it but want to be proud of where we live, it wouldn't change the world but it would change lives. And maybe if it gave more kids a chance and desire to go to college they could continue to change lives and who knows maybe they could change the world.