Again, it's entirely up to you and your thread partners. And since her magic is natural to her type of creature, you also get to decide if mordecai powers would even affect her. It defaults to affect basic magic and magic casting, but things that magical creatures need to live by are generally up to the player to decide (and probably should be noted in their profile)
Also, I'm confused what you're asking hidden, since the conversation at present is revolving around Sil's character and thread~