Scanned Diary Pages
Warning This Section Does Contain Spoilers
The scanned diary pages look like something inside Isabella is fighting with herself. There are several spots where there are words scratched out. Some legible and some not. The ones that are legible make it sound like she is talking in the third person. Like something in herself is speaking. She also leaves a passage alone and by itself as a clue:
The moon was a big white hole in the sky.
To see how to use this passage please visit here.