Ms Gulley, who is Kapiti College head girl, founded the group in 2013 and now works as a Girl Up teen adviser and an ambassador. With the help of her family, the Year 13 student organised Wellington's leadership summit for 2015 and 2016.
During this year's event, she stepped in to host a workshop, How to Start a Girl Up Club, which gave delegates advice on how to get the ball rolling in their schools.
Fellow Kapiti College student and Girl Up Kapiti College president Lisa Tweedie also ran an interactive workshop.
Titled How to Become a Social Media Superstar, the workshop explained how delegates could use social media to reach out and promote important messages, Ms Tweedie said.
"The leadership summit aims to empower young people, especially girls, to make a change in their community, whether it be in relation to Girl Up or something else," Ms Tweedie said.
Female guest speakers on the day included Trilogy skincare co-founder Sarah Gibbs, Indigo & Iris founder Bonnie Howland, Victoria University student Eve Bain and Hygiene for Homeless founders Katie Daly and Gabby Embury.
"Each of our speakers shared their experiences of success in the workplace and empowered our delegates to fearlessly create positive change in the community, encouraging them to unlock their potential as leaders.
"Sarah Gibbs held a workshop How to Network, to help our delegates understand the power of communication and how networking can help their ideas and voice be better heard," Ms Tweedie said.
The Year 12 student said overall, delegates this year were enthusiastic about Girl Up as an initiative.
"The summit was incredibly rewarding to be a part of," she said.
"It's a great reminder as to why Sarah, myself and the rest of the team at Girl Up Kapiti College do what we do," Ms Tweedie said.
