In "Charles," what/how can readers infer about how Lauries mom felt about Laurie growing up?

Lauries mom is sad and a little
overwhelmed that her oldest son is growing up.

The first thing
that Lauries mom notices is that Laurie has renounced his little boy clothes and started wearing
more grown-up attire.  Her son wants to be more grown-up and independent now that he has started
kindergarten.

I watched him go off the first morning with
the older girl next door, seeing clearly that an era of my life was ended, my sweet-voiced
nursery-school tot replaced by a longtrousered, swaggering character who forgot to stop at the
corner and wave good-bye to me.

Lauries mom has her hands
full.  In addition to her boisterous son, she also has a baby to take care of.  It is difficult
for her to stay on top of both children.  When the baby needs attention, she often focuses on
him at the expense of Laurie.  This causes Laurie to act out in a desire to get any kind of
attention.

He came home the same way, the front door
slamming open, his cap on the floor, and the voice suddenly become raucous shouting, Isnt
anybody here?

Lauries desire to make waves leads him to
act up at home and at school.  He also invents an imaginary classmate he calls , whose exploits
he can describe without getting in trouble.  When Laurie tells his parents about Charles, they
are interested but only absently.  They are more interested in their everyday lives and have no
idea that Charles is their son.

His kindergarten teacher tells her that the
adjustment was tough, but Laurie is getting better. By the time Lauries mom realizes that her
son is the Charles he has been describing, Laurie is finally straightening out.  The teacher
tells her that there is no Charles, and this is how she finds out that Laurie invented him.