How is the ending of The Cat Returns supported by its plot and themes?

While point A and B are both clear, I don't understand how the movie's plot leads Chizuru from A to B. I also don't understand what themes are presented by the plot that tie into her character arc. Can someone explain what the movie's themes are and how the plot directs Chisuru's character arc throughout the movie?

Begin with Point A..

Point A -- Haru gets up late, looks a mess, skips breakfast, and is late to school. As a result, her classmates laugh at her, including a boy that she likes, which embarrasses her.

Fast forward to when Haru is speaking with the brown cat about the invitation to Cat Kingdom..

Even after hearing about Haru having to marry a cat if she goes to Cat Kindgom, she contemplates the benefits of such a place:

HARU: Who knows, maybe I'd fit in better with a bunch of cats. You get to lie around all day don't you? ... A cat's life sounds great. Eat all the food you want, take naps in the sun, forget about all your problems.

Needless to say, Haru just wants to be lazy, and so, Cat Kingdom sounds appealing to her. Even just saying so, though, gets her into trouble, as she soon finds herself in Cat Kingdom.

Now, fast forward to Haru's experience in Cat Kingdom..

Haru is now in Cat Kingdom, but she has a terrible time. Mainly, she starts turning into a cat, and her cat friend dies. Because of this, perhaps Cat Kingdom isn't all what it's cracked out to be..

And finally, Point B..

Point B -- Haru's returned from Cat Kingdom, is back at her house, and no longer fantasizes about blowing off her daily routine/responsibilities. She gets up early and cooks breakfast for her and her mother, reads the newspaper, and is already well groomed. And then, when she hears about the boy in her class being single again, Haru is indifferent, which surprises her friend.

Not only has Haru become more organized and in control of her life, but, she's also gained a kind of confidence in herself.

So, in the end, this is a case of, "be careful what you wish for, because you might just get it".

Fortunately though, it would seem that Haru learned a lesson from it all, and has matured some.