I think it was done well!
Maybe a bit too easy. I think they chose to do that because of time, you can't have it all in a movie. But just small things could've shown a bit more struggle.
In the book Bella's nervous about having to jump out of a window. In the movie, she just jumps of a mountain, no problem, no second thoughts to it, just jump.
Jacob tells them Charlie is coming. Edward snaps at Jacob because Charlie being there will give Bella physical pain. Yet when Charlie's there, everyone leaves Bella alone with Charlie
And it doesn't look like she's struggling with him being there at all. It seems uncomfortable, but nothing more than that. (off course, I only saw the movie once, so I might remember this wrong
Being a vampire seems to come natural to her. Which, of course, it does. And it's not like I wanted to see a lot of struggle or her having a hard time dealing with it. But a bit of adjusting would have been nice to see.
But yeah, I liked her as a vampire a lot.
From what I've read so far, many people don't agree with how her shield was shown, but I thought that was done really well.