I suppose her obsession with books, which is pretty ridiculous for a commoner in that world, is helping masking her weirdness in people's eyes. Perhaps the parents think she's so strange because of the frequent fevers. Superstitions and all that. As long as she hasn't pulled off anything truly outrageous, people would overlook a lot since she's a kid. Lutz's pov would be a bit different because he's also a kid himself, so he would view Main as a peer and thus more readily notice odd things.