Re-reading this chapter after several years, I didn't really think about it at the start as it was a infodump after another but I must say is very badly done how the young girl couldn't do magic.
Her granpa is introduced later as a master magician of the country, and he tried to help her, how is possible that he didn't try to teach her a simple spell he himself knew?
I can understand a old man trusting the book from the school made for new mages and that it would have simple magic for beginners, and even lacking the skill to understand if a magic circle is good or bad, so he would start to think that the niece is inept, but not trying once to teach her something he knew?
The magic was made to make people with low mana unable to cast, onyl who had a lot could and it would waste it, feels unnatural the magician never tried to cast it himself and notice how bad it is.