You're weird, Jess.
Personally, I think you're on the right track. Most people would write about things they want to think about, or remember, in a journal/diary.
Going off Grace's comment; Yeah, some of the things that happened in DA to/with Mia should probably get a mention. You could even have something about how Mia wants to know what Rhiannon's hiding, if you wanted. I'll let you have that much.
Rhiannon: *still won't tell Mia about the wedding and what did or didn't happen there*