She was born Samantha Gail Weinstein in Toronto in 1995. She started her acting career at the age of six, in a theatre camp where she had one week to put a play together.
For Siblings (2004) she auditioned with the recital piece, and "had to practice it a lot but eventually really got into the character". In 2008 she told in an interview, "I'd study to be a Lawyer or Doctor...But I find acting so much fun". Weinstein was screened for Case 39 (2009) and True Grit (2010).
In the independent film Jesus Henry Christ (2012) Weinstein appeared alongside Toni Collette and Michael Sheen.
Weinstein graduated from Vaughan Road Academy with Ontario Scholar status in June 2013.
