I'm looking for a book called Nadia.

A friend of mine gave it to me as a gift a while back and due to several moves I have lost this novel. It's set in the old west with a family going across the great expanse and wild of unsettled America. The father passes away and the girl runs into a werewolf and a romance ensues. They arrive in civilization once again and Nadia takes her leave

I'm not sure who the author or publisher is or where it's printed.

I need help!