The Nobile Exiles (Ocean Black #1) by EJ Wedge
 
Space opera character drama; running the ladder of subplots and features of sci-fi and fantasy, from post-apocalyptic samurai, bear cavalry, and space pirates, and an interstellar political power struggle.

"Melinda DuVanqueth is a child genius, and scion of a wealthy family, living hundreds of years in the future. A sudden crisis distracts her family from her regimented care, allowing her some intellectual freedom for the first time in her life. She sets her will to investigate the war crimes of her family’s two patriarchs, and then, the origins of the crisis that set her free. Who would dare to try and kill her grandfathers, Sonny Aemrose and Able DuVanqueth?"