One of the stars of the YouTube family vlog channel Bratayley who later signed with Disney's Maker Studios. She plays the character Harmony on the web series Chicken Girls and has also appeared in the web series Mani. In 2018, she began starring on the Brat web series Hotel Du Loone. She has her own self-titled YouTube channel where she has posted makeup content, challenges and more. She has also collaborated with other social stars on her channel such as Paige Danielle, Rebecca Zamolo and Indiana Massara.
The Bratayley channel was initially created for her. Bratayley is a combination of Brat and Hayley.
She appeared with her brother Caleb and sister Jules on another YouTube channel called OMMyGoshTV. She has over 3.9 million followers on her hayley.leblanc Instagram account. She launched a YouTube channel called Jam JR in 2018. In 2020, she became a member of the Run The World girl group. She was featured on the cover of the February/March issue of the magazine Girls' Life.
She is close friends with singer and fellow Chicken Girls star Carson Lueders.