I helped her in some categories and after I told her everything my father told me, we are still good friends till today and she already quit gambling, later after I started making some money I start my own gambling activities but when I told her she doesn't seem to be interested or moved about it.
There is no point in paying attention to gamblers around you, most of them always become a victim to their own desire and greed through gambling, it's better to avoid them and take your responsible gambling very serious, watching others can fuel up your desire for gambling and it can lead you into making wrong decisions.
From your last clause it looks that it is better to pay attention to gamblers around, because you can learn from their mistakes, from their bad experience. For example, with me watching others place bets, I have seen people who made large bet, lose and quickly make even larger bet to win bank what was lost. Risky, irresponsible. That is a reminder for me to play smart. Guy failed, I've got experience. Why that is bad?
P.S. So what is that story with that girl? Just a filler? She has gambled, and lost everything. Your father warned you about dangers of gambling. You met her later. Now you have money and gamble, she knows that, but dont want to return to gambling. <--- And? What conclusion should I make after reading it?