Why didn't she stick around for Atlas Shrugged Part 2?

Given the subject matter, she probably, feared being blackballed by open-minded liberal Hollywood.

Yeah, the way Clint Eastwood was for his hard-right Dirty Harry movies...oh, wait.

But yeah, the way Jon Voight was for travelling around with Prager and...oh, wait.

Hollywood: cares about money. Period. Nothing else counts. Nothing.

Because her career took off and she didn't have to settle for Atlas Shrugged anymore.