Seems like the author is having her be the naive type. The intentionally-written-to-be-stupid-and-taken-advantage-of-kind-of-person. Makes sense when you consider things.From Elena’s perspective, Queen Lupis as a leader was too immature.
Political ability, Diplomacy, Economy. Except for the military, she lacked all of them.
As the head of the nation, she’s not very reliable.
The reason for that is also clear. She lacked the experience in internal affairs, and also for the better or worse, her own good nature as a person.