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A Sydney mother, whose 15-year-old daughter, Matilda "Tilly" Rosewarne, took her life after severe social media cyberbullying, called for global reform Wednesday at an event on the sidelines of the United Nations General Assembly in New York – banning children under 16 and holding tech companies financially accountable.

In a heartbreaking speech, Emma Mason detailed her daughter's final moments, as she attempted to take her life for the twelfth and final time on Feb. 16, 2022.

"My brave little girl, determined to look pretty, put on her makeup one last time," Mason said. "She had planned this moment out in detail. … Exhausted and broken, she just couldn’t fight anymore. She climbed on top of the backyard tree house, she sl

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