Yeah but as far as I know none of it was “de jure” power, all “de facto”. Also the high elves were generally pretty chill and as far as we know didn’t have tons of political intrigue or rivalries, so even if Kel’thas mom did have power in the political sense there wouldn’t be much to use it for considering high elven society, especially for the ultra wealthy and powerful, was pretty idyllic.
Again though this is all just wild conjecture there’s no way Blizz would have Quel’Dorei having concubines LOL.