Well, one common theme could be the struggle of the ballerina to maintain her art while dealing with an illness. Maybe she has to overcome physical limitations due to being sick while still trying to execute that perfect leap.
I'm sorry, but I'm not aware of any specific 'ballerina leap sick fanfic' stories. Fanfic can be quite niche and hard to come by without proper research on specific fanfic platforms.
Leap Year was a Mexican film that was released in Mexico in 2010. The movie was about the heroine, Laura, who spent her lonely and depressed days in a small apartment. Laura was a female editor of a Mexican business forum. She worked in her apartment all day, and her pastime after work was to peek at the lives of the neighbors and couples in other buildings. Through the constantly changing angles of the camera, the film played down the fatigue that the audience might feel. It showed the psychological pressure that the urban people faced in the rapidly commercial society, as well as the loneliness, depression, and despair deep in their hearts.
I'm not sure as I haven't read the story. But usually, you can find the main characters by looking at who is most involved in the main events and who the story seems to be centered around.
Since I don't know the exact content of 'the leap full story', I can't give a proper summary. However, a good way to summarize a story is to first identify the beginning, where the story sets up the situation and introduces the characters. Then find the middle part which usually has some sort of conflict or development. And finally, the end which resolves the conflict in some way.
In 'The Leap', Erdrich uses vivid descriptions to bring the story to life. The setting, perhaps a small town or rural area, adds to the overall atmosphere. The characters are well - developed, with the mother being a particularly strong figure who has overcome many challenges in her life.