A dual power system of a Queen and a Prince Consort. It wouldn’t be strange if it caused a civil war in the worst case.
(Indeed, if you think about it like that, it’s understandable that she wants to specially call a groom from a different world. There is no proof that a groom from a different world has no political ambitions, but at least he won’t pull any strings for his own family. Although it just prevents the groom’s family from abusing their power as the consort clan, it’s a reasonable action.)