Things go differently for Bella when Edward leaves, and after college, she leaves to travel through the mountains. Imagine when she wakens to a whole new world that only had been hinted at in a book that is regarded as fantasy.
Disclosure: Twilight and Lord of the Rings are owned by their respective writers and holders to the rights. I own nothing. Perhaps if I did, this would have been what happened, but since I don’t hold a candle to Tolkien, yeah. This is my own humble try.