Quote 55
I want to confess everything, to hand over the guilt and mistake and anger to someone else. (24.4)
Melinda is thinking of herself as a criminal here. It takes all school year for her to understand that she is instead the victim of Andy's criminal act.
Quote 56
There is a beast in my gut, I can hear it scraping away at my ribs. Even if I dump the memory, it will stay with me, staining me. (24.4)
Shame seems to be a big part of why Melinda doesn't tell. She feels like the rape is alive in her, has somehow become part of her, like a punishment for making wrong choices like drinking beer and kissing a senior.
Quote 57
BunnyRabbit bolts, leaving fast tracks in the snow. Getaway, getaway, getaway. Why didn't I run like this before when I was a one-piece talking girl? (47.14)
Melinda's blaming herself for not trying harder to escape Andy, or for not recognizing him as a violent predator. In a way, this is good because she's planning ways to escape him. The best way would be to report him, but she's not thinking along those lines.