Miss Sperling said she was very excited by the win.
"I was amazed. I was the youngest there ... and I was up against the girl who won the year before."
She had grown up showing dogs, learning from her mum, also a dog handler, but never imagined she would be heading to a global competition so soon.
"I'm the youngest to ever qualify, it was quite amazing."
Going up against the world's best juniors up to the age of 20 was no barrier for Miss Sperling.
"I'm going to try my hardest."
Her trick to preparing for competitions was to study YouTube videos of the previous year's winners, focusing on the manoeuvres they used.
She practised "stacking" her dogs three times a week, standing them in the correct position for their breed standard to allow judges to examine them.
She had handled a number of breeds and was often paired with a dog only minutes before a competition. "There isn't many I haven't showed with ... I prefer the bigger breeds. I was brought up showing the big dogs."
Competitors run through different exercises with their dog.