Rosalie
Hello Rosalie, from what I read in the books you did not like me, neither did you speak to me until a year or so later. It made me feel unwelcome and I was afraid of you. I always wanted to get to know you though. I thought of you as a sister. I hope that if we ever get the chance to do it over again, you'd give us a chance sooner.
I can't say I don't understand your reasons. I am a human who knows about your family. You believe that I was – or still am - a threat. You would do anything to protect those you love. In that, you and I are not so different.
Another reason you did not like me is because I was willing to be turned. You believed I was throwing potential possibilities away and hated me for it. We never talked, and when we did I was still very afraid of you so I never explained my reasons.
You refused to recognize my choice because of my age, and because you have reservations about this life. What you didn't want to see was that I did not share the same dreams you had. I had everything I could ever want at the time. I'm not going to ask you to change a single thing about that Rosalie, you are entitled to your views. I only wish that you don't force them onto me and respect me as a person.
I know this letter is not going to make you receive me any easier, so I'm going to risk it all by saying something that you might hate me for.
I love Emmett dearly. From what I read he was happy to be a vampire and welcomed being with you without reservation. Please try to understand how it must hurt him to feel like he is not enough for the only person he lives to give his all, you.
Every time you express your desire to be human and have children with or without him it must be hurtful to him. It's like his forever is circumstantial and conditional, yet you brought him into this life. I know you don't want to read this. I also did not want to write it. He can also hurt Rosalie. Ask Jasper, or Edward. Dare I say even Carlisle?
There isn't much about you and I in the books that does not give away information I cannot share at the moment. But you should know that we became friends and true sisters in the end. You were honestly and truly happy. I suspect there'll always be a part of you that is not truly healed, but for the most part, you were very happy.
Bella
Rosalie's voice had lost steam as she read more and more of Bella's words. She wanted to hate the girl for writing these things to her, but she couldn't feel the emotion. He minds focus was on Emmett who sat next to her. He looked like he didn't have a care in the world though she could see that the letter had sparked something inside him. She chanced a glance at her brothers and father, all of whom had found an interesting spot on the table to stare at.
"Jasper?" Rosalie asked.
Her sometimes 'twin brother' gave her a questioning look. After a moment she was hit with a sharp wave of the self doubt and the sadness that Emmett felt when she read her letter.
"That's it, whose reading next?" Rosalie decided that she'd talk to Emmett later, not in front of her family.
She also made a mental note to refrain from killing the girl Bella if she meets her. 'She is not even worth the effort' she thought bitterly.
Edward just raised a questioning eyebrow at his sister's thoughts.
'Some things don't change' he thought. He was amused to see Rosalie reduced to size by simple words.