The protagonist is always the character who is the most changed or transformed by the dramatic action in the story.
At the Climax (the scene right before the Resolution at the end), the protagonist does something to "show" the ultimate change or transformation. Whatever she does at the Climax -- the crowning glory of the entire story -- she is unable to do anywhere else in the story. She has to first endure all the dramatic action that comes before in order to gain the abilities and skills and new understanding of herself.
Make sure the action the protagonist takes at the Climax reflects this inner and outer growth and ask yourself if she could have acted in the same way anywhere else in the story.
Yes? Then rethink the Climax.
No? Then you're good to go!
