As an actress, she is known for her roles as Daisy Fuller in The Curious Case of Benjamin Button (2008), Doris Solstad in The Master (2012), Rebeccah Mulcahey in Other People (2016), Talya Banks in the ABC Family series The Fosters (2013–2018), Iris in The Magicians (2018–2019), and Patricia Krenwinkel in Aquarius (2015–16) and Once Upon a Time in Hollywood (2019).

Beaty portrayed Sara Dougan in 2010 Lifetime movie The Pregnancy Pact, co-starring with Thora Birch.

In 2012, she appeared as Doris Solstad in The Master, a Paul Thomas Anderson film also starring Philip Seymour Hoffman, Joaquin Phoenix, and Amy Adams.

[4] In November 2015, it was announced that Beaty had been cast in a regular role for the second season of NBC's period drama series Aquarius, portraying Patricia Krenwinkel.

[5] In 2016, she starred alongside Chad Michael Murray and Luke Wilson in the Western thriller Outlaws and Angels.