Moira Bronzebeard did have some bitterness due to how she was basically treated like shit by her father and then her father hired adventurers to kill her husband. However, she now wants what is best for hr Dark Iron clan and the Bronzebeards who, by all rights, she is the Queen of.
Funnily enough, her baby is technically the ruler of the Dark irons (but not the bronzebeards) assuming Warcraft Dwarves use real life rules of succession.