Anna didn't want Danny's pity. She knew that she would have to stay in Maine to take care of her little sister. (She didn't want to be selfish and uproot Katie and drag her across the pond.) It was easier for her handle things that way. She could just totally reinvent her life and let Danny move on without her.
Hey, I'm the author of the Burning Edge and it's sequel. If I came up with another sequel to If You Can't Live Without Me, would you read it? I'm just asking before I plan it out and then nobody reads it. Thanks. :)