As far as i know, its not about what she "knows" but more like what she "have" ...
As it seems, she was in Avernus in the past, and *somehow* won a soulcoin ... and now the fiend who owned it before wants it back. O_o
Dunno where it take bugbear tho. :-/
I still dont understand why cant we change Race for our hirelings.

Lets us play Githyanki as racist as they trully are!