You really think those women change? I don't know... I think they just lose their looks and can't get away with behaving that way anymore so they adapt.
Honestly, if she's acting like that, it sounds like she's not mature enough to handle a serious relationship...she's 17 and starting her partying phase...I know when I had my partying phase, I couldn't commit to a relationship... I don't want to sway your opinion in any way, but this sounds like how I was at her age and commitment to someone young and into partying isn't exactly a priority...