She tells Lucky magazine, "I won't lie, there are times when I'm like, 'Why is this so hard?' You come off a high like Twilight and then you get dropped back down to reality... Twilight has given me something to skyrocket off of. But now that it's ending, there's so much work to be done. And if I don't do it, then Twilight's all I'm ever going to be known for, as great as it is.

"Basically I went from 'dying to get a gig' to 'dying to get the gig that everyone wants'. So now I'm in this realm with a lot of highly respected actresses, which is an amazing place to be, but also kind of terrifying."

Greene will next be seen in the final Twilight installment The Twilight Saga: Breaking Dawn - Part 2 as well as Demi Moore and Miley Cyrus' upcoming comedy LOL.