Thank you both for the clarification. I had assumed she was playing Evan's mother, which is a much larger role. But the film may be making significant changes. The linked article says that Danny Pino is playing Connor's stepfather, a role that has been "conceived specially for the film." So Cynthia Murphy may be a bigger presence in the movie.
I'm wondering if Connor's stepfather is replacing Michael Park's role, or if it's an additional role.
I've read that they're changing the biological father to be a stepfather. I guess that opens up some incremental opportunities for heightened "drama" (and/or a tangential storyline) between the characters...