She was born and raised in San Diego, California. The youngest of four, Sunnie has two older brothers and a sister.
It was evident from an early age that she loved performing. With older siblings in the industry, it allowed her to start her career at age three, starting with a Hugies Pull Ups commercial. Her work continued on into modelling for Hanna Andersson, an online children's clothing retailer, as well as Jakks Pacific, a toy packaging company. Her first audition was just after turning 4, where she got the role as Christine.
Outside of acting, she is an avid dancer in jazz, tap, lyrical, contemporary, and hip hop.Her first tap solo was at age three. She travels for competitions, takes classes, and attends conventions.