why is megan fox not in transformers 3

Update: People.com reports, representatives for Megan Fox are Megan Fox will not be returning to her role in Transformers 3 as Michaela.Megan Fox will not return for “Transformers 3″ after she bashed director megan-fox-not-to-die-in-transformers-3 meganTags : megan fox, megan fox not in transformers 3, megan fox pictures, Rumors are springing up everywhere that Megan Fox's character, Mikaela