If she considers nobles useless and wants to only hire the best people for the job, she's actually working against the very foundations of the country, including the monarchy. Absolute monarchy is autocratic and thus inherently corrupt. The absolute ruler has an inherited position, nothing to do with skills or talents. Nobody can rule a country alone, so there must be plenty of underlings. Each and every one of them wants a share of the cake, following the example of the autocrat, and they must be accepting the nature of the government. Certainly the ruler can change the underlings somewhat, but especially if someone else starts doing it, it ultimately begs the question of why not replace the ruler themselves with someone more competent. Or even remove the whole monarchy if favour of something else, like republic. That's obviously the ruler's greatest fear. Starting from the ruler, all the nobles and other aristocracy would like to fancy themselves irreplaceable. It's a delicate house of cards, where the will to keep it going forever is more important than competence.
It very much seems to me the princess's aide is trying to make the princess perform a political suicide by shaking the established order too much.