The Reformed Vampire Support Group: Catherine Jinks

The trouble with being a vampire is . . .
You can't get a decent haircut. You live on guinea-pig blood. And even worse, most of the world's population wants to kill you. For no good reason. Nina Harrison became a vampire in 1973, when she was fifteen. Since then, life's been one big drag - mostly because she spends all her time with a bunch of vampires, in a vampire therapy group.
Then one of them gets staked by an anonymous vampire slayer, and things become even worse: while tracking down the culprit, Nina and her fellow vampires end up in the middle of an illegal werewolf-fighting racket, and find themselves the target of some genuine villains who'll stop at nothing to get their werewolf back.