Man if they really acted like children, they would fucking HATE her, because being accused of being someone else, the bit of hostility and suspicion. Kids don't like that shit.
I'm actually interested in this mystery for a change. Lately, it has been easy to guess who's the real culprit, but with this one, all I have are guesses
Sera is the one who receives the most flak in this series besides Genta. Clearly a undeveloped characterization from Gosho. Not going to blame him too much, after all it is said that it was editor's wish to introduce a female detective based on readership response.