NEW YORK (CBSNewYork) — A woman was viciously attacked by a group of teenagers on the subway in Brooklyn – and she said it all started when she decided to speak up about their behavior.

As CBS 2’s Jessica Schneider reported Monday night, the 21-year-old victim said she was beaten by three teenage girls when her subway train pulled into the Seventh Avenue G Train stop in Park Slope.

It was a brutal attack the woman, named Amanda, said that all started because she asked the teens to stop swearing inside the crowded subway car.

“I said, ‘You guys should be more respectful for your age. There’s a bunch of children on the train right here, and that’s unacceptable,’” the woman told Schneider.

Amanda, who did not want to reveal her last name, said she made the simple, peaceful plea to the group of 14- and 15-year-old girls on the afternoon of Sept. 10. The result was violence, she said.

“They pushed me out of the train at my stop. They shoved me,” Amanda said.

Amanda said a group of three girls knocked her to the ground and started kicking her.

“My hearing; my vision went out. I couldn’t move,” Amanda said. “And they were relentless. Like they were just like trying — if they had had time, I really believe that they would’ve killed me.”

Amanda said she was overpowered and couldn’t fight back. One man who was on the subway train with her pulled those teens away before Metropolitan Transportation Authority police came in to arrest the girls.

Amanda was rushed to a trauma center for serious head injuries.

“I have two bruises on my knees, I have head trauma and a concussion, and I have to take it easy for a few months,” she said.

As of Monday, Amanda was back home now, with her mother relieved and commending her daughter for standing up for what she believed.

“I’m very proud of her. I taught her well,” Amanda’s mother said. “But I feel bad that she got hurt in the process. Sometimes you have to pick your battles.”

“I’m grateful I’m OK, but I realize sometimes you do need to keep your mouth shut on the subway when things are going to escalate,” Amanda added.

One of the girls was arrested and charged with assault and disorderly conduct.

Meanwhile, Amanda has resumed riding the subway.

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