I took that to mean that she is suicidal between the noose and "so lonely" added with the bullying that we have seen throughout the rest of the episode. Maybe Kate has something to do with/knows about Rachel Amber's disappearance which could further feed into her depression.
But yeah, there are a loooot of small things, I should look through all of the posters, etc. in Max's journal.
Edit: If you're talking about the top stuff, I assumed that was camera/lens related
She probably knows something about Rachel. ERRRGH This just makes me want to continue more!
Also the files. "She knows something" might be part of that.