Answer:
Jane makes sure that the words are being spoken by Celia herself and the conversations she has with herself.
Explanation:
In the first paragraph of the passage itself, Jane Rogers helps the readers understand Celia's complex perspectives through the words "Hitting trees makes me think of the way they sometimes feed remains of animals to the same species - pigs, for example.".
Throughout the passage, Jane makes sure that the words are being spoken by Celia herself and the conversations she has with herself help the readers understand that the author uses first person point of view.