Span All Worlds

Lila Ming met Bailey Thelen her freshman year of college. They were both involved in a Live Action Role Play at their college. She was the elf queen and he was a Knight of Dunil. It was a fairy-tale meeting. For two whole weeks, she was enchanted by him. Every minute of her life was perfect.
Then the high started to wear off. She realized that he wasn't listening to her. All he wanted to talk about was his ideas, his book, his stories. But she still felt like he was the one for her, and she was confused. So she lost herself in her writing. She re-wrote their story, except in a parallel universe where he understood her.
Then he showed up in the rain one day to help her get her keys out of her car. Except it wasn't Bailey--at least not the one from this universe. It was the warrior she created, and he was there to bring her home to Dunil with him.
But things aren't all as they seem in Dunil. When she was outside the story, she had control, but now that she's a character in the book...who's writing the story?