I cannot comment on her specifically, but in response to this comment:
"...I'm surprised she could be so successful if she truly has this attitude."
I've worked with several successful people, including non-celebrities and celebrities ranging from A-list to D-list. Success has zero to do with 'attitude,' unfortunately. I've seen SO many tantrums within my relatively short amount of time working in the industry. It's just personality. It's who people are. And you deal with people as they are. When their reputations build, sometimes their careers fade away, but you would be surprised at what people can get away with!!
I am STUNNED at how many times people are allowed to mess up and continue to work year after year after year.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle