J.H.
"Into My Garden Tea Room" which is inside Nooks & Krannies in downtown Plano. http://www.intomygarden.com/index.html
There were also some tea shops listed in response to a request for baby shower locations. Here's a link to that post:
http://www.mamasource.com/request/2881071789809598465
I'm sure the girls will have a great time at whichever tea shop you choose! And what fun photo opps!