When you infiltrate the Thalmor HQ in Skyrim you can listen to some soldiers discussing new mages sent from Alinor. One mentions that "Herself" (capitilized in the subtitles) must be worried about the dragon attacks.

Who/what is "Herself"?

Elenwen, the Ambassador I would say.

Is it some Altmeri honorific?

No, it means to indicate the way underlings speak about superiors when superiors are not present, especially if they are disliked.

Like you can call the boss 'his majesty', 'mr nitpick' 'bossy mc bossman', but never to his face.*
In this case it seems to indicate that Elenwen has quite a high opinion of herself.

*(Unless youre Merari cause I will do that. Im odd though and people make allowances for odd Ive found.)

An ironic honorific, I imagine. They didn't strike me as the most respectful of subordinates.

Good point.

Well that's terribly boring then. Sorry for wasting your time.

No worries.
Refreshing really to have a question thats easily answered without linking to a dictionary.