Jeez, what a hypocritical cunt.
She claims that vampires only kill humans to survive. But if vampires need to kill humans, then it's in humanity's best interest to kill every single vampire and prevent more humans from getting killed. A vampire needs to kill many humans in its long lifespan to stay alive, so she's killing many people for only her own selfish survival. But a human killing a vampire doesn't just save his own life, but also the lives of the many humans that the vampire would have killed in the future.
Simply put, she's infinitely more selfish and greedy than the people she's accusing and if she truly believed that killing to live is just, then she should have killed herself.