Of course, Gwen and Corbin’s family had no way of knowing this. Corbin himself was usually a friendly man which is part of the reason why he was willing to take the chance and train Gwen when he saw her potential. There were some people in the tribe who were not so gracious; such as Merik, the young man who mocked Gwen when Sirus arrived. He seemed to have a vendetta against Gwen for punching him when she was brought to the tribe.
Gwen, on the other hand, wanted to show the best of what being with these people had done for her. And she felt the best way to do that was to be, mostly, open with her guest.