"My aunt will be down presently, Mr. Nuttel," said a very self-possessed young lady of fifteen; "in the meantime you must try and put up with me." Here the child's voice lost its self-possessed note and became falteringly human.
This is an expert which is showing us how and why is she described as someone who is self-possessed. Also, this is showing us how confident she is since she is saying ''you must try and put up with me''?
She is confident because she thinks that she could get trough with anything and anyone, but they cannot get trough with her. It is giving us the feeling like she is the smartest person even she is just a child.
