It's from the oils in your face and everyone has it. If she did it, the same thing would have happened. You'll get a little older and stop caring. Although, make sure you wash your face properly daily!

"... pretending to be frustrated." Because being frustrated makes you so much more appealing?

Don't worry, Rudolph, she already noticed your nose was greasy by the way it shines. If she likes you, she'd hose you down and roll you around in flour to get you ready for a date.

I wouldnt worry too much about it. you sound young, young people naturally have oily skin. honestly, if you dont say anything she probably wont either. And if she decided not to hang with you after this happened then that means shes incredibly shallow and not worth it anyways!