The bluff has been called!
Past behavior is no guarantee of future performance.
It's usually a good indicator.
s/usually/frequently but not always/, as one says in vim and other places.
I don't think she's bluffing. She's not all that great at alchemy--rather like someone who has taken it up fairly recently--but she's rather well-informed about Xanthropus.
Now I'm wondering if her pretty face is a, well, glamour....