Yeah, it is. If she refuses to obey the orders of her superiors and induces others to refuse as well then it's mutiny. The military does not take kindly to junior officers and enlisted deciding what orders are valid and what are not. Ask Mike New and Ehren Watada how that works out.
I would love to ask Capt Watada, seeings as the government dropped the charges against him and his courtmartial was in mistrail.
However, the case is distinctly different in that the war in Iraw was lawful. The question regarding the eligibility of the President is an entirely different matter.