Isabella: Protector of the Last Dragon by m. anthony phillips
Approx. 73,540 words.
Published on March 31, 2012.
Isabella Treehorn, a lonely 12 year old girl of mixed heritage, befriends a formally frozen celestial dragon by the name of Tianlong, who tells her she's the descendant of a 16th Century Jade Princess, and that she must go on a long journey to help him find its mate in the frozen Mongolian mountains while being sought by the demons that destroyed his kingdom.