T.W.
A relaxing Girlfriends weekend sounds SO much fun!!!!
When we get together we like to have lunch or dinner at Love and War in Texas (fabulous food and great Texas atmosphere) http://www.loveandwarintexas.com/
There is a really nice tearoom, on the main street in Plano. The Chicken Salad is YUMMY! http://www.intomygarden.com/ Lots of really cool lil shops there too.
If you like Antiques, I enjoy shopping at Antiqueland. Its located on the service road, across the street from Collin Creek Mall. Just North of Plano Parkway. (next door to Hooters)
Anytime my girlfriends visit they want to go to Sam Moon and load up on jewelry...there are 2 locations, Frisco and Dallas.
http://www.sammoon.com/
Hope you find these suggestions helpful. Have a great time.
T.