Maybe she has connections with Godbert Manderville and got the hide from him? He's always killing chimerae.

Anyway, I have to note something: Tataru is emphatically not as naive and willing to trust as people seem to think. One of the first things we learn about her is that she was chosen as the receptionist for her knack for discerning those of good intent from potential menaces.Just because she's sweet, adorable and tries to keep positive doesn't mean she's a fool.

This also doesn't mean that she's secretly evil, because that skill is something she's quite open about.