RotGirl by Y M Miller

She'd only wanted to be kissed. But now she only wants revenge and your beating heart in her fist. Edie Bramble doesn’t fit in.
She smells like formaldehyde, talks to dead things, and dreams of love like other girls' dream of weddings.
So when golden boy Theo invites her to prom, she says yes.
But the invitation is a joke. The humiliation is real.
And the nickname they give her — Rotgirl, becomes a state of being.
Edie dies that night. But she doesn’t stay dead.