I know the beginning, my MC wakes to find herself in the body of a dragon and a world where magic is very real.

I know her consciousness will switch between living in her dragon body and her human body. She will alternate time between the two worlds.

I know the ending, she enters, mentally, the space between the worlds and severs the link between the two worlds in order to prevent them from crashing into each-other. (I don't intend to reveal which world she finds herself in at the end.)

Other than that I have only a few vague ideas, and that's the way I like it.