The actress, who played Johanna Mason, said it's been "hard" to think about her

character or the franchise "without feeling the sharpness of this moment in time."

Jena Malone, who starred as Johanna Mason in The Hunger Games franchise

says she was sexually assaulted during the production of one of the films.

The actress, who made her debut in 2013's Catching Fire,

opened up about the experience for the first time in an Instagram post on Tuesday.