I've been thinking about other things to suggest. I don't imagine that all of these are new to you and E--first, Zita the Space Girl and Amulet, this one.
Then I asked Reason (with parameters "for someone about your age who might like to learn more about how people interact from books rather than straight from watching people, and she has a little brother"), who said instantly, Harriet Hamsterbone. :P
She seconds Amulet and suggests Dogman and Yo-kai Watch, the latter on grounds that learning how to make friends with yōkai is not so different from learning to make friends with humans. They're not really much like yōkai, I think, but that's the conceit.
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Then I asked Reason (with parameters "for someone about your age who might like to learn more about how people interact from books rather than straight from watching people, and she has a little brother"), who said instantly, Harriet Hamsterbone. :P
She seconds Amulet and suggests Dogman and Yo-kai Watch, the latter on grounds that learning how to make friends with yōkai is not so different from learning to make friends with humans. They're not really much like yōkai, I think, but that's the conceit.