1. Is it selfish of Bella to ask Edward to sit out the battle, knowing that it will increase the danger to the rest of his family?Yes. But I understand completely why she did it. I know how it feels and I would ask him the same thing...I can be selfish like that too. Just imagining him in danger...if you can get him away from it...then no matter what, you do.
2. When Bella asks Edward to sit out the battle for her, he looks into her eyes for a long time. She sees his eyes "tighten with some emotion I couldn't read" before he picks up the phone to call Alice and make the necessary arrangements. What do you think was going through his mind?He saw that she felt guilty about asking him and that she was super worried about him and thinking about when he left her, and he decided that if that's what she needed, he would do it.
3. Do Edward and Alice really believe the danger from the newborns is as trivial as they say, or are they trying to make Bella feel better?They're pretty confident it won't be a problem, with the wolves. They know it's possible something could go wrong, but even if they have doubts, there's no way they're going to tell Bella because that would just make everything worse.
4. Why do you think Bella feels it’s more like being with the old Jake -- “easy, effortless, as natural as breathing in and out” -- when he is in wolf form?It's the way he naturally is, not moody and pressuring her to change her mind like he does when he's human. He's not his older, post-werewolf human self. And he can't talk.