Before joining "The New Archies," Burthwright builds her career as a voice actress in Canadian animation, working in studio recording environments and collaborating with directors and ensemble casts. Her early work helps develop her skills in vocal performance and character consistency across episodic storytelling.

Burthwright is also known professionally as Karen Bernstein and appears in a range of animated series during her career. Her work includes roles in projects such as "Beverly Hills Teens" and later voice performances in children’s programming, contributing to her experience across different animation styles.

In addition to animation, Burthwright participates in television and film projects, expanding her experience across multiple formats. Her career includes work in both performance and voice acting, allowing her to build versatility across genres and production types.

Outside of acting, Burthwright later transitions away from voice work and becomes involved in talent representation, continuing her connection to the entertainment industry through professional development and creative collaboration.