Why isn't Megan Fox going to be in the new Transformers movie?

Did she get fired, or something?Why isn't Megan Fox going to be in the new Transformers movie?She was giving an interview saying how terrible it was working for Micheal Bay. Soooo he made sure she wouldn't have to go through it again. lolWhy isn't Megan Fox going to be in the new Transformers movie?They said something about her mouthing off or making the director upset or something to that effect.