Actually, Dwarven is Talia's first language. Her father taught her that first, and common and other languages second. I have it in her back history that she was seven when she started learning. Her father decided that she should be able to speak with her aunt when she came to visit, otherwise he probably wouldn't have bothered teaching her.
Man, her screwed up childhood is one of the best things about this character.
Well, Talia's disappointed to be sure, but clan always comes first. Talia would probably think of him better for it. With adventuring Dwarves you never really know if they still put clan first or not.