Yeah, a lot of the time children are insufferable and bratty on show.
There's a scene in the trailer in which Octavia tells Madi she knows what it means to be the girl under the floor and that she doesn't have to be afraid anymore. I wonder when this scene happens?
I was talking to Paula about this scene and we think that Madi might have been kept under the floor by her family, so that the flamekeepers wouldn't find her would explain Octavia referencing being kept under the floor.