I don't have a Counselor, need help

There is another poster posting about being a resident of 2 states, b/c her parents are separated, her dad is military and has one identified state of residence, and she lives with her mom in another state. She insisted she can claim to be a resident of both states, but if she lives more than 50% of the time with mom in a different state (and will graduate from HS in that state) how can she claim to be a resident of the dad’s state? I don’t know who declares her as a dependent in taxes (assuming they file separately) but for FAFSA purposes moms is primary residence.