the trick is to keep breathing

Well, yeah, see, and that's the difference between having magic and being a mage, as I said, particularly a white mage. XD Cecil is a paladin, but his loyalties are specific to his duties. He fights for Baron or for Great Justice or for some form of righteousness, and the magic aids him, but it's for that specific purpose. If he ever walks away from that path to something else, for whatever reason, his tools have the possibility of fading into something else.

While this happens to mages, it's not as often, and, in many cases, you simply are what you are, and what you are directs your path. I theorize even if Rosa had never met Cecil, or been born to some place besides Baron, she would still be a white mage. In parallel, it's the same as Aerith being a Cetra and the keeper of Holy, whether she's in the labs or the slums or halfway around the Planet. It's inherent to her nature.

And, yes, Baron would have trouble with this. Even Cecil would probably have trouble, and forget from time to time, because, well, his white magic is tied to his duties, not his duties to his magic. It's so very ironic, too, because you have this friction and almost distrust that develops between white mages and party members, or factions, or any number of associations that the mage originally made the sacrifice to BE a white mage for.

Most of the world is used to this being important, or that. They are used to a heart having priorities. They are not used to EVERYTHING being important. Everything, everyone mattering just as much. But that's kind of the point. Everything matters, because it is all One: Rosa becomes a white mage for her love of Cecil, because she wants to share the love he has for the service of Baron, because Baron the kingdom is the symbol of Baron the people--and, eventually, both of their feelings transcend to a love/belief in a righteous principle, the idea there should be a balance, a rightness to the world.

By the way, that idea of true balance over accumulation of power, even under a noble conceptual principle, is often how white mage archetypes wind up with relationship dynamics to on-the-fence villains. The kind of Fallen Angel types, the divided loyalty types, any that are dynamically turning the tide (like Kain). A white mage has an inherent understanding not of what we think of as situation ethics and necessary evils, but a sympathetic/empathetic understanding of the necessary existences of ghosts in the machine. They accept that scars and amputations, so-called imperfections, might be as much a part of the healing process as restoration.

Trying to make this more than just a self-indulgent ramble, see, yeah, I think what Rosa the Woman wants is going to be forever bound in the path of Rosa the White Mage. Maybe that conflict between the duties of a white mage as seeking balance and healing for the universe by the support of the individual with what Baron would want in a Queen would be the central catalyst?