All right, I am sick of seeing Rosalie being defamed and demoted, and I have decided to post evidence of her conversion. She seriously changed throughout the books, but a lot of people don't see it, and take everything she says and does as bad! Any how, here is her documented change throughout the books; I've only taken a few quotes from each, but there are plenty there.
"I guess there's no other choice," Carlisle agreed, his face grim. Edward turned to Rosalie. "Get her upstairs and trade clothes," Edward commanded. She stared back at him with livid disbelief. "Why should I?" she hissed. "What is she to me? Except a menace — a danger you've chosen to inflict on all of us." I flinched back from the venom in her voice.
So yes, she's mad, mean, selfish, etc. at first.
Edward is composing again? Rosalie thought, and her teeth clenched together in fierce resentment.
In that moment, she slipped, and I could read all her underlying outrage. I saw why she was in such a poor temper with me. Why killing Isabella Swan had not bothered her conscience at all.
With Rosalie, it was always about vanity.
Again, just more proof that she's vain, selfish, etc. But she doesn't have a personal vendetta against Bella as a person, just as a rival: Rosalie doesn't understand.
"I'm so very sorry, Bella. I feel wretched about every part of this, and so grateful that you were brave enough to go save my brother after what I did. Please say you'll forgive me."The words were awkward, stilted because of her embarrassment, but they seemed sincere.
So she's embarrassed, yes, but on the road to improvement: admitting your mistakes is the hardest part of conversion for anyone, and once that's done, it just gets easier to change. She's no longer "in denial".
“Please don’t think I’m horribly interfering,” Rosalie said, her voice gentle and almost pleading. She folded her hands in her lap and looked down at them as she spoke. “I’m sure I’ve hurt your feelings enough in the past, and I don’t want to do that again.”...
“I can tell.” Then she sighed. “I haven’t been fair to you, either, Bella. Did he tell you why? Or was that
“I apologize for being such a monster.” She grinned. “I’ll try to behave myself from now on.” I grinned back at her. We weren’t friends yet, but I was pretty sure she wouldn’t always hate me so much.
Here we finally see her reasons for not liking Bella, but also, perhaps subconsciously, a desire for Bella's good. Rosalie wants Bella not to hate human life, wants her to treasure it; and Rosalie's also trying to warn Bella about what comes next: true friendship looks out for the other.
Did the beauty queen want Bella to die so bad?
“Maybe,” he said. “Rosalie doesn’t look at it quite that way.”...
“Don’t touch her! You’ll wake her up,” Rosalie whispered. Someone sighed. “Rosalie,” Carlisle murmured.
“Don’t start with me, Carlisle. We let you have your way earlier, but that’s all we’re allowing.”...
Rosalie grinned at me, and I was glad to see that the new comradeship between us was still there in her smile. I hadn’t been entirely sure it would last after Renesmee’s life was no longer tied to mine. But maybe we had fought together on the same side long enough that we would always be friends now. I’d finally made the same choice she would have if she’d been in my shoes. That seemed to have washed away her resentment for all my other choices.
So, unless Bella as a vampire is really stupid, Rosalie seems to have changed, yes, because of Renesmee, but still, she's Bella's friend, even after the baby was born. And it doesn't seem that Rosalie really thought Bella would die, see the first passage: obviously, Bella's idea that she could survive like all of the others was feasible in Rosalie's mind.
So, yes, Rosalie was a pain in the back at first, but, and this is my point, BUT SHE CHANGED! She was not out for the baby, but for Bella's decision. She would not have even stopped Renesmee's death if Bella had not called her, but Bella's decision was the proof that Bella and Rosalie both valued the same things, and they found a point of agreement.