Elsa is not the most frequent character in the movie but has some memorable moments. Here are all I spotted:
1. Child!Elsa is woke up by Anna and make the winter wonderland in the palace hall. She hits Anna with her powers and then is taken with her to the trolls.
2. Elsa cries lonely in her frozen room over the death of her parents.
3. Elsa prapares herself (and her powers) to the coronation.
4. Coronation of Elsa.
5. The coronation party and Elsa's escape.
6. Let It Go song and the building of ice castle/tranformation of Elsa.
7. Meeting with Anna in the ice castle - Elsa hits Anna with her powers again.
8. The battle in the ice castle - Elsa is taken prisoner.
9. Elsa confronts Hans in the dungeon.
10. Elsa's escape and snowstorm chase. Elsa is almost killed by Hans but Anna saves her.
11. Elsa changes ice!Anna into living human again.
12. Ice slide at the end of movie and happy forever after.
I guess, even if Elsa is not the main character, we get a lot of her in the end :) I cherish these moments in the movie and am always happy when our beloved Snow Queen steals the screen.