Signe probably has about as many questions for Beth as Beth might have for Signe--and learning more about being a mage would be really, really great. Stuff like "um so why did that guy turn into a monster?" for one thing. She's also not familiar enough with the Chantry to even recognize that she's an Apostate, right now; she knows that humans keep their mages all in one place but I think that she rather naively assumes that this is because they can all learn from each other there or something. Like, the Tower? Clearly, it's the Mage District of Ferelden in the same way that Orzammar has different districts for different castes.