Destoni says she has a reputation where people know not to cross her, or she will come after them. The 14-year-old admits that she has chased her sister and her sister’s babysitter with a butcher knife, punches and hits when she gets mad, and has spread rumors about teachers in school. But Destoni's most serious offense came when she threatened to shoot other students and teachers – leading to her being suspended numerous times.

TELL DR. PHIL YOUR STORY: Know someone with outrageous behavior?

Destoni, however, claims that’s not how the incident happened. “I said that he’s lucky he doesn’t have bullet through his head right now, because he was talking [expletive] about my mom,” she tells Dr. Phil on Monday’s episode.

WATCH: Mom Says Teen Is Violent, Acts Out, Tells Her To 'Shut The Hell Up'

In the video above, hear more about Destoni’s offenses, including threatening other children and yelling in the hallways that her teacher has chlamydia. Why does she say she behaves like this? And does she say she will act out on her threats?

On Monday, hear more about the teen’s behavior – and see how she acts with Dr. Phil producers before the show. Check here to see where you can watch. And on Tuesday, Destoni comes face to face with a group of her peers. Plus, see what happens when Dr. Phil offers her help. Check here to see where you can watch.

TELL DR. PHIL YOUR STORY: Problems with your teen?

'What Are You So Afraid Of?' Dr. Phil Asks Teen Who Lashes Out