is there a shop for half size, pre-teen aged girls, ages9-13, who cannot
wear size 16 childrens clothes?

Hello!

There are a few resources on the net for plus sized kids clothing.  A
list is on http://fashion.about.com/library/weekly/aa072400a.htm .
.
I know that JCPenney, http://www.jcpenney.com , specifically has a
pretty big selection of clothing in the size range you're looking for.
 Locally (to the US), Sears carries plus sized clothing in their
stores.
.
There are also some hip clothes at http://www.plussizegirls.com/ and
http://www.gfla.com/ .
.
I hope this helped you.  If you need clarification on this answer,
please ask away!

My suggestion would be to take her to the adult petite sections of
department stores and buy larger sizes.

A preteen girl who is larger than a 16 would probably be more
comfortable in clothing designed for adolescent girls, since heavy
preteen girls often have some breast development which would make
children's sizes too tight across the chest and back.

You can order an online directory specifically designed for plus-size
teens here, at a cost of $9.95:

http://www.largerteens.com/

"The Plus Size Teen Directory is primarily an online Directory that
lists companies/websites that specialize in clothing & resources for
plus size teens. Some of these websites also have paper catalogs which
they will send you."

Hi,

The today show just has a segment on this topic and I just wanted to
share with you the website they highlighted.  Good luck with your back
to school shopping.

Size Appeal- http://www.sizeappeal.com/

Torrid - there own label and many mainstream designers
http://www.torrid.com/

Tommy - size 14-24 http://www.tommy.com/

Alight - all teen! http://www.alight.com/?AID=7064271&PID=212158

Lisaradha