Generation Gap?

Does 7 years make a generation gap?

It is currently 4:51am Eastern. I was woken up at 3:30am by the phone incessantly ringing only to hear that my sister (whom we will call Mshley to protect her identity). She was trying to leave CityPlace to go somewhere else with her friends but locked her keys in her car.
In my humble opinion, there are several things wrong with this situation:

1) It's 3:30 am! I am almost 25 years old and I generally don't even stay out that late! And I think I have a fairly active social life and hit the bars quite a bit. What the hell is a 17 year old doing out at 3:30 am!

2) She wasn't even trying to come home! It's not like she was like "Wow, its late, I'd better go home". NO, she was heading off to the next party.

3) She locked her keys in her car, and the simplest way to get them out was for me or Mom to take her the spare key ... BUT, Mshley apparently got mad and didn't want Mom to have the spare key, so she's had it in her car. So, because she's a ... well, bitch ... it cost Dad the money for AAA to get her door open.

4) Now, last time we talked to her she had gotten her keys out, they stopped at Taco Hell, then were bringing her car back here and then she was going with her friend to take her boyfriend home.

Ok, seriously folks. I do have to say that when I was a teenager, I had a curfew for one week only, and that was because I had gotten in trouble. So, as long as I called to check in and gave a time that I would be home and the parents knew where I was, I was allowed to stay out. I still don't think I stayed out that late. What the hell is there to do? Especially for a freakin teenager!
I can't say that I don't stay out this late every once in a while, cause lets face it ... sometimes I do. But there is a difference ... I'm 7 years older. I live on my own, I pay my own bills (granted, there are two that I don't ... so not fully independent yet, but I'm working on it), so I'm allowed to.

And she's mean. She's horrible to my Mom and uses my Dad for money. She attempts to be mean to me, but I'm much better at it when I need to be. She knows that she can walk all over them and get away with it. So, I guess when you are a 17 year old girl that knows she can get away with murder, you go ahead and do it.

This all leads me to the biggest question: How do two kids with the same parents end up so different?

And this is just Mshley. Don't even get me started on Mrystal.

And so goes the life ...

P.S. It's 5:10 and she's still not home.