There is a really good chance she may be nominated for an Oscar this year. So maybe she is going the 'hey, my profile is rising. Time to take advantage'.
I would not be surprised if she left the 'Family Guy' cast too.
Unless the list of supporting actresses this year was is really short and weak then she should be nominated. Other wise she doesn't deserve to be nominated. Sure I enjoyed her performance but she was in the movie for like 9 minutes and basically just played her role in Forgetting Sarah Marshall. The academy really needs to stop nominating actors and actresses to increase the nomination count of a movie they really like.
Now Natalie Portman's performance on the other hand was awesome!