To arrange the summary of the story correctly, you should follow this sequence:
1. "Cora and Ruky are orphan siblings who take care of each other. Cora is the older sibling and has been like a mother to little Ruky."
2. "One day, Ruky frustrates Cora, and she makes a wish that instead of being crow-like, Ruky were really a crow. The wish appears to come true."
3. "Finally, Cora wakes up and discovers that Ruky is fine and human."
This sequence captures the progression of events in the story.