Honestly, Bella's transformation didn't really bother me. I knew from the get-go that she would NEVER kill a human.
One of Bella's personally traits is that she is always looking out for everyone but herself. She's always worried about everyone else getting hurt. I knew she would carry this with her after she turned and she wouldn't have it in her to kill anyone because she was always worried about others.
I do wish Stephanie would have just talked about those 3 months and how easy it was instead of jumping from September to December just like that