Wow, what was that in page 10? "There is something about her eyes, one look is enough to calm the heart..."? She is supposed to have zero magic ability, but is that really true? Maybe she just has ONE ability, and it's not something she can use at will (it's probably always active), and only Olivia was immune to it due to her strong belief that her way of life was not wrong? It wouldn't be the first time "charm eyes" appear in a fantasy story. It may be a skill that's impossible to detect with regular magic.
I would love it if the story takes a turn like this and makes Sophia a villainess, though, in all honesty, I doubt the story will take a turn like this and Olivia will just end up mellowing out, accepting her way of life was wrong, and become a lovestruck idiot joining the MC's harem. Pride be damned.