If I had to put it in a few words...this is the Super Short Summary to Rightful Heir
Girl destined for arranged marriage to the Crown Prince meets elven shape-shifter and falls in love. Prince reluctant to give up childhood sweetheart anyway. Babies are born, people die, war is fought and won. Girl and elf reunite in the end. Lord of the Rings meets Harlequin romance. Book two is in production.