I think it's ok that she's not over-powered. The story already established that the prince is overwhelmingly strong both in magic and social position.
Rather I think it's very sweet that both Sharina and Reol have to rack their brains and work together in order to fend them off.
It's very rare to see a FL and ML who works together, and that she clearly expresses how she feels towards him and his kindness. I think it's a breath of fresh air?
Her being not op is not the problem.
My only issue is that she isn't competent on her own.
Most of the time she either keeps admiring, praising & cheering for her boyfriend or getting rescued/guided by him.
That Baron ML is very nuanced but the FL is a practically as useless as Princess Peach only with a little more attitude and optimism.
Just as a reminder...she's 15. She's not a reincarnator or anything.
Sharina grew up pampered like a princess. That Riol is this smart, is rather more abnormal tbh...? ^~^a)lll Either way, given the theme and nature of the story, I think it'd be weirder if she suddenly became more smarter or competent out of the blue...
Plus it's only been 5 chapters so far. I think for a 15 year old this much is normal. It's not like she's 30 and in a life threatening situation.
Good point but since this is a fantasy story, why not give her some strenght or competence on her own?
Well it is my personal preference and I did read all the translated novel chapters...
Sharina is a very positive upbeat happy to go lucky shoujo heroine but she is a damsel.
https://www.novelupdates.com/series/the-noble-girl-who-finds-a-nerdy-and-plain-guy-moe-thinks-that-the-arrogant-prince-is-in-the-way/
Talking about a pampered princess:
https://www.youtube.com/watch?v=5ab4rYDR0yY
Cleopatra’s Little Sister vs. The World (feat. Aubrey Plaza and David Wain) - Drunk History

I read the translated novel chapters in novelupdate and The Fl is basically just an upbeat Cheerleader & Damsel in Distress for the very smart competetent unusual ML.
She can't actually do anything on her own.
Her incredible non duke-prince ML always saves her.
I really like this kind of ML and their love dynamic but it is quite annoying that this girl can't protect herself at all.