How we cite our quotes: (Poem Title, Stanza)
Quote #4
Even good girls have their secrets, ones even their best friends must guess. (More On Bree.3)
It's amazing what a clear picture of Kristina's unhappiness with her family situation comes out in the early poems of the book. In this case, it's pretty clear that there was a lot of stuff Kristina wasn't telling people even when she was still the good girl version of herself. Most likely, she suppressed her family's problems in much the same way her mom does, while still trying to propel herself forward to satisfy their impossible expectations.
Quote #5
Oh God, who was in the mirror? Not Bree, not Kristina, but some evil incarnation glaring back at me, a horrid red-eyed crone, materialized as if from darkest dementia, nightmares to come, hibernating inside of me. (Coming.4-6)
What's literally going on in this passage is obvious: Kristina woke up from her crash after using crank and looks terrible. Still, it's a frightening enough image to her that Kristina thinks of it as something evil that's been hiding inside her.
Quote #6
Funny thing, your brain, how it always functions on one level or another. How, even stuck in some sort of subconscious limbo, it works your lungs, your muscle twitches, your heart; in fact, in symphony with your heart, allowing it to feel love. (Brain Lag.3)
The mind-altering effects of crank seem to awaken Kristina to the fact that even when she's unconscious, her brain doesn't stop working. There is always some part of her that's actively engaged.