Welcome to Gaia! ::

1.) You are given a test at school that has questions that teacher hasn't covered yet. In the middle of the test you notice that your friend next to you has a cheat-sheet. The teacher doesn't notice.
The teacher may not notice now, but depending on how that friend has been treating her, Natalie could do one of two things. The first, if the friend had been being nice to her, would be to keep her mouth shut. She doesn't need the cheat sheet - she spends enough time at the library (considering her home life, where else would she spend it? With her drunk father? She thinks not.) to know things ahead of the curriculum.
If the friend was more of a frenemy, Natalie would endeavor to manipulate the situation to get them caught, and seem blameless in the whole thing.

2.) While walking down the street you see a wallet on the side of the road. It has a small amount of money in it, but no identification of any kind. There is nobody in sight.
Well, duh, dibs. There's no way to figure out who it belongs to, and if she doesn't take it, someone else will. Besides - that money could go to a good cause. Said good cause likely being her pocket, but still.

3.) Someone has played a prank on you which involves your public embarrassment and everyone begins laughing at you. However, you doubt they meant any harm by it.
If someone is laughing, harm has been done. Revenge will be exacted, however it will perhaps be subtle revenge. Their life will slowly begin to unravel around them; small incidents at first, but then slowly larger things. A lost bus pass, a photo of them at a party being anonymously sent to their parents..
And, gosh, who could possibly be doing such things? Certainly, not Natalie.

4.) You have arrived late to work because you had a flat tire. You've been on time every other day for the past month, yet your boss yells at you about it in front of all your coworkers.
Guess who's getting a sexual harassment report in their file? Mister big tough 'embarrass Natalie'? Ding ding ding, we have a winner. Nobody shames her and gets away with it.

5.) You're class has is splitting up to take part in different in volunteering activities around the community. You can volunteer anywhere you want.
Most likely an afternoon dance class for little kids. Such a thing was a great comfort for Natalie when she was young - she would leap at the chance to offer the same to another little girl. (or boy. She isn't sexist.)

6.) A little kid accuses you, in front of a whole crowd people, of stealing his toy which you did not do. You are twice his size, but he won't back off.
Admit to stealing the toy, and hand him a barbie, or a similar toy that would embarrass him. Little brat wants to start s**t? Fine. Natalie can play whatever game he's trying to play, but better.

7.) You have saved up for months to buy a new bike. As you're getting ready to buy it, a child runs by and steals your money. You chase him down and find that his mother is deathly ill and the child stole the money to buy her medicine.
Let them buy the medicine, but keep the little brat in debt. Make him do things for her in exchange for the money.

8.) A friend of yours tells you that there is some really cool stuff in an old abandoned building. When you get there you see a sign that "Danger: Do not enter!", but the building doesn't look dangerous. There is nobody around to see you, and your friend wants to check it out.
In they go - Nat has never been one to balk from a challenge. However, she would likely pull a prank on her friend while they're inside. Trick them into thinking they're in danger, or in trouble, or..something. She would love to see the look on their face.

9.) A very strong man approaches you while you're eating lunch and demands that you give him some food. He doesn't appear to be starving or poor. There is nobody there to stop him from taking it.
A very strong attractive man? Well, why can't they share? Natalie would most likely seduce the man into letting her keep at least half of the food, and possibly get a date out of it.

10.) Your two best friends are fighting over a small issue. Each of them ask you to choose their side.
Natalie probably started the fight, to see what would happen. At that point, however, she would smooth things out between the two of them to get life back to normal. Chaos is fun, until it impacts her life. Then it's interfering with her enjoyment, and needs to stop.