I would argue that Twilight has more than one resolution because there are multiple conflicts that exist throughout the entire story. I would argue that the climax to the story is the fight between James and the Cullen family. Bella is bitten and injured in the process. This conflict is resolved when Emmet and Jasper kill James. Bella is still in danger of becoming a vampire, so that resolution comes about when Edward successfully sucks the poison out of her without turning her into a vampire. The final resolution deals with the love story that has been playing out between Edward and Bella. Bella still deeply desires to be with Edward forever, and she wants him to make her a vampire. Edward isn't sold on doing this to Bella just yet, and the book ends with them having another discussion about it. Edward states that he will love Bella forever, and he wants to know if that is enough for Bella. She responds that it is enough for the time being. Essentially, the resolution to their relationship is that it will continue as is for now.
"Bella." His fingers lightly traced the shape of my lips. "I will stay with you—isn't that enough?"
I smiled under his fingertips. "Enough for now."