Leslie was born in Livingston, New Jersey and resided in Millburn. Along with acting, Leslie developed an interest in photography. She attended Millburn High School, graduating as a junior in 2008, and subsequently moved to New York City.
After appearing in commercials with a friend, Leslie said she became dedicated to her acting career at age 15. She was cast in the Spike Lee-directed pilot for M.O.N.Y. in 2007, but the pilot did not receive a series order. Her television debut came in 2009 with a guest appearance on The Unusuals as Karen Delmonte, the high school girlfriend of Detective Eric Delahoy. The following year, she played Eliza, a 17-year-old caught exposing herself on webcam in the series finale of Law & Order, Mia Caruso, a magazine intern whose publisher is murdered on Law & Order: Criminal Intent, and flirtatious student Parker on 90210. She also made her film debut in Beware the Gonzo as Amy, a popular high school student. Leslie's guest roles on television continued in 2011 with an appearance on No Ordinary Family as Chloe Cotten, a new friend of the Powell family.
In 2012, Leslie portrayed Angie in the psychological thriller film Chained, a young woman abducted by a serial killer to be murdered by his reluctant apprentice. DVD Talk reviewer Jamie S. Rich praised her performance and although critical of the overall film, wrote that Leslie played her character "with heartbreaking gravity".

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