Brown moved to Los Angeles with her family in 2013 and she began her acting career. Her first foray to the small screen was on "Once Upon a Time in Wonderland", a spinoff of "Once Upon a Time", playing Young Alice. She had a few more guest roles over the years in shows like "NCIS" and "Modern Family" before landing the role of a lifetime at 12 years old for Netflix’s sci-fi horror series "Stranger Things".