Working alongside her brother, she is best known for being the founder of the YouTube channel Keilly and Kendry Adventures. Together, they would create slime content, do challenges and record vlogs. She also has her own channel called Keilly Alonso.
She was the lone member of the channel at first, posting solo videos such as "Justice Haul (first Video)" and "Slime Smoothie." The channel was called Keilly Slays at that time.
Her and her brother's channel would accrue more than 300,000 subscribers.
She would co-run her popular YouTube channel with her brother Kendry. They have an older brother named Kevin.