Weizenbaum was born in Seattle, Washington to a Jewish American mother and a Chinese father, and was raised in the Jewish religion.[1] She grew up from the age of two in Amherst, Massachusetts. For years African Dance was her primary love. She also enjoyed being part of Amherst's local musical theatre productions. She was called for an audition for Missing in America after someone saw her perform in a local production of Peter Pan. Since finishing this movie, she has also had principal roles in 12 and Holding, directed by Michael Cuesta, and in Memoirs of a Geisha, directed by Rob Marshall. Weizenbaum attended Amherst Regional High School for her freshman year before she decided to go to Pioneer Valley Performing Arts Charter Public School where she is currently a student.

She is the granddaughter of computer scientist Joseph Weizenbaum.