Adventures At The Park is the sweetest chapter, it actually made me feel emotional! Great work.
Do you mean Red writing home to siblings that have moved out from her old (back story) home? If so, then couldn't it change into Dear Dairy... rationale being that Red knows her lil' piggies have flown the nest and that one day they will turn up unexpected for a visit wanting to know all the gossip and so she's going to write everything down so she doesn't forget?
Or that she supposes this is what happens as she doesn't get replies anymore?
Using 'dear diary' idea allows other characters to write/add their chapter in easily too.
If that's not what you mean disregard my ramblings