Help me find a Short story?

[KatyMac]

It's Sci-fi set in the future with matter transmitters and a little girl (or boy) decides to walk home

& eventually get gets a cold and is sent to a psychiatrist who then walks home to

I read Heinlein< Asimov and a lot of MacCaffrey when I was younger but I can't put my finger on it

Be prepared to be disappointed with the Heinlein though. I recently reread a few of his for the first time in years and they were horribly dated.

van Vogt on the other hand just get better and loopier each time I read him.