When I first watched the anime that had come out so far, I didn’t originally classify it as top-tier. Only after reading the LNs did I get really excited about it. Going back and watching the anime again, I was surprised at how good they were at choosing the parts to animate without changing the story very much.
One thing they changed compared to the anime is that Myne is somewhat more weak and sickly in the books. So, it’s more natural if she collapses with Cornelius and then with Wilfried. By the way, I think those two scenes are months apart.
Also, in this episode, it sort of looks like she fainted with Cornelius because she was walking too much, but in the book, it’s clear that she mostly got overexcited about the book room. They kind of showed this in the episode by showing how happy her face was after she collapsed and was in bed, presumably dreaming about the book room.