She’s no chicken!

Even with a gun pointed at her head, a Harlem schoolgirl refused to hand over a McNugget to a hungry classmate bent on getting his hands on her grub, cops said.

The tough-as-nails 13-year-old bought the 10-piece snack at a McDonald’s at Lexington Avenue and East 103rd street Tuesday ­evening, cops said.

Almost immediately, a classmate at Harlem Democracy Prep asked her for a McNugget — and she ­refused.

But her 12-year-old tormentor wasn’t taking no for an answer, and followed her into the 6-train station at 103rd Street.

He pulled a gun, pointed it at her head and once again demanded a McNugget.

That’s when she showed nerves of steel and smacked the gun away, sources said.

She told the kid, whom she knew from school, to get lost and then she got on the train.

The pint-sized criminal quickly boarded the same car and showed off the gun to another child. He did not approach her again.

The victim didn’t say anything until the next afternoon, when she told officials at the middle school.

Police arrested the boy, whose name is being withheld by The Post because he is a minor, on robbery charges. The case will be handled in Family Court.

Cops have not found the gun, which law-enforcement sources said the boy would often show off to other kids.

Classmates admired the girl’s courage, but wondered if she should have just handed over a nugget.

“She’s brave to do that,” said a 14-year-old named Jaden, who lives in East Harlem. “If the gun is not on safety, you don’t know if he’ll pull the trigger by accident. It’s brave but not the wisest move to do.”

But others said she made exactly the right move against the small fry.

“If you see a bullet coming you, got to do what you got to do,” said Diata Ouaattara, 14. “The boy should be kicked out of school. That is craziness over chicken nuggets.”

The suspect, on the other hand, is as lame as a side salad without dressing, said the kids.

“If you can afford a gun, you can afford a chicken McNugget,” said Jaden.

Additional reporting by Tina Moore