Jupiter's Heir

Girl just coming out of Juvie gets attacked by creatures from another world. One she has not seen or heard of before. A team of highly professional assassins help keep her safe. It turns out there work for the second in command at the crown. The crown runs all races, clans, packs and so on. It's her, who needs to be crowned ruler of all. These assassins need to keep her safe from the present ruler. She wants her dead. She knows that she is not the rightful ruler and all of her followers start to notice as well. The queen is the one attacking her, though no one knows that. She ended up hating her and wanting to take her place of queen away from her.