Dear Devs, can you let us know if the Aesthetician will allow Au Ra to change Limbal?

[kyuven]

And why shouldn't we believe Jandelaine can use magic like just about everybody else?

What "everybody else"? Magic isn't all that common among the people, it just seems that way. Plenty of people have no magic aptitude at all. Part of the THM quest deals with that, and the CNJ quest makes a point that Raise is an exceptionally powerful and rare spell for non-Padjal. Lore-wise, there's only about 6 actual black mages, 2 Summoners, and about half a dozen White Mages including the player.
If body altering magic were at all common, we'd have spies all around us. So far the only beings we've seen use magic to alter physical bodies have been Primals, Sylphs, and certain Voidsent.