The seventeen-year-old gymnast saw off rivals from the USA, France, Russia and Belgium to take the gold medal for the first time.
Heather, a member of Richmond Gymnastics Association (RGA), has been tumbling since she was six-years-old. The discipline involves running down a 25 metre long spring track and performing skills such as somersaults, back handsprings and twists.
"This was not my first world age group championships as I have competed for GB before, but it was certainly the best!" said Heather. "I practice at the RGA four times a week and couldn't have achieved my medal without the support of my coach, Rob Small, and my training partner Hannah McKnight."
Upon completing her A levels in the summer, Heather plans to study a sport and business degree at Loughborough University and is also interested in becoming a tumbling coach.