[@skarsgard] If we are going with the other two magical girls in Zargoth's arsenal they have been around FOR ALONG TIME. 12th & 13th Centuries to be precise. That is more or less 900 and 800 years worth of experience. :P

Fiona has only been working under Zargoth for at least a year but she was told to stay in her home and act as if she had never became a Magical Girl. And she's good at lying to people who aren't Light Magical Girls. So yeah... 

Edit: But that was before the mission she got from Justine. And additionally from Zargoth since he wants his sister found...