How do I deal with an annoying coworker?

[I_Love_Penguins]

Over the last seven months at my job on campus (I work in food service here), I have had to deal with a sometimes pain in the ASS coworker. She's not even a college student. She is 16-17 and got a job partly because her mother runs another food place on campus. No secret.

Anyway, my problem with her is that I am a little annoyed with her attitude. On Friday night, our closing supervisor asked us to do her one more favor when we were done with the cashier closing duties. She said oh can you help me put the chairs back at the tables on the one side. Well I was like yeah OK cool, but my coworker was like I WAANNAAA GO OUT WITH MY FRIENDS. It bugged. :x And my supervisor tries to tell her, no no it won't take long and the chairs aren't heavy. My coworker kept whining about how she wanted to go out and didn't want to stay. Hello? When you have a job, typically you sign up to well...work. I mean, the way I saw it, friends can wait.

Then one of her friends calls her cell phone and she talks to them for like a few minutes. She gets off the phone (yes, she was talking on the phone while I was moving chairs!) and she starts bugging our boss to please please PLEAAASEEE let her go (and yes she actually sounded like that on the last please) and my boss is finally like GO. After she left, my boss told me that the girl left some of our job undone and guess who got stuck picking it up? Yep. Me. And my poor boss. For the record, in case anyone is interested, it didn't take me long to move those chairs. 10-15 minutes AT BEST. Why her friends couldn't wait that long was beyond me. But hey, whatever.

Tonight another incident happened where we were very busy and as usual, we were down at least one staff member. Guess what this chick was doing? She was basically la-de-daing about and just standing around yapping while the rest of us, managers included, were working their asses off trying to serve god knows how many students. I couldn't believe it! We literally had to tell her to jump in and take orders because I guess she couldn't figure out on her own that geez we looked busy and could use her help rather than her standing-around-doing-nothing-and-wasitng-airspace-ness (like my new word?). Then at close, my boss asks her to do something else and she's like oh I don't wannaaa. His reponse? God forbid I make people work. Believe me, at that moment, I totally wanted to tell him how much I agree. I even told the chick...I said honey, you are here to work. God forbid you actually have to do something. I know, not my place or time. But I just let it slip.

The odd thing is that I have not held any other frustrations against this girl until what she pulled Friday night. I just couldn't believe I witnessed her whining to my supervisor about how she wanted to go out and not work. Any other place, we know (and even she knows!) that she'd get fired in two seconds. However, I suppose that she is kept around because her mother is an employee.

I don't know what to do. Do I?

-Try to let the girl know she is on my nerves and didn't like seeing her act?
-Approach a manager? One who will actually listen? (I already know who I would talk to because I get along amazingly well with one of my bosses and she takes no crap. From anyone. End of story.)
-Ignore her?
-Ignore the problem because there is only three weeks left of school anyway?

What would you do? I think all of my solutions are feasible. I'm just not sure which is best.