Basically a Disney princess version of The Two Towers.
This is why people end up hating on feminism. Because a couple of guys decide to write a thinly-plotted movie that lacks logic and superficially shows a woman striving to be independent. First, kill all the male heirs ahead of her as fast as possible so she can be put in that situation, then make her be "inspiring" with "pretty words", and lastly make her reject the throne. What a girl boss.