At 14, Gabrielle says she’s sexually active, wants to be homeschooled, and smokes marijuana “for breakfast, lunch, and dinner.”

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

On Thursday’s episode, Dr. Phil asks the teen, “Do you have any idea what the research says about the neurological impact of that on a teenage brain?”

“No, and I don’t care,” she responds.

Gabrielle’s mother, Kaylie, who admits to smoking “weed” with her daughter, claims she’s tried telling her about the risks.

“But yet you give it to her,” says Dr. Phil, outlining the documented effects of marijuana on the teenage brain.

How does Kaylie defend her decision? Tune in to part one of this two-part Dr. Phil airing Tuesday.

Then on Wednesday, learn why Gabrielle’s grandmother, Roseann, says what’s going on with her granddaughter “completely terrifies” her.

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

‘It’s So Inappropriate, It’s Beyond Me,’ Says Man Who Claims His Ex Allows Their 14-Year-Old To Party And Have Sex