In From the Mixed-up Files of Mrs. Basil E. Frankweiler, why does Claudia enjoy planning?

One of Claudia's character traits is her ability to plan. 
To a great extent, her need to plan is to compensate for a certain amount of emptiness
that she perceives in her own life.  Her need to plan is a measure to demonstrate to her
parents and others that she is capable of assuming greater responsibility and
understanding the implications of it.  What planning gives Claudia is a voice and power,
elements that she feels is missing from her parents when they perceive her.  At the same
time, planning is the critical element that will help define her.  Claudia understands
that if she does not plan properly and fail in her running away, her parents will
continue to see her in what she perceives to be a devalued light.  It is for this reason
that planning is so important to her.  It is also for this reason that she enjoys
planning, as it serves to validate her own opinion of herself as being precociously
mature.  Planning gives her this conception of self that is otherwise not apparent
around her in the world.  It is for the reason of voice and power that she becomes an
character who enjoys planning and sees the value in it.