God let Sam relive her last day so she can go to Heaven.
Sam was a bitch for most of her life, but God loved her enough to give her a chance to die as a hero so she can go to Heaven instead of Hell, like she originally deserved. Lindsay was sexually assaulted.
When she bragged about losing her virginity she was masking her shame and fear. This was around the time that she started wetting the bed, which often is a sign of sexual abuse.- In the book this is pretty much spelled out as much as Lindsay can be trusted to with "The Unmentionable". At the very least it was something that turned non consensual if not an out and out predatory rape from start to finish.
