Yeah so here are my current theories
1. Zeta and Alexei were soul mates, he could lure her out to kill her using this
2. Everytime Anya regens she loses a bit of her humanity. This is probably a mental reaction so it explains why the drowning didn't cause her to become a inhuman machine.
Phantom Racoon
Racoon Tendency
Stardust Racooners
Racoon is Unbreakable
Racoon Wind
Racoon Ocean
Steel racoon run
I like Racoons