I have a troop of high school girls but there are plenty of troops in the area. Contact Emily in the local Girl Scout office at (800) 733-0011, ext. 307. She should be able to point you in the right direction. Many troops aren't active in the summer with camp and trips going on so you might not be able to find one until closer to the start of the school year. Good luck and hope you have a great scouting experience!
My daughter is in a troop that is a solid group of 2nd-6th graders. They are split pretty evenly - 5ish brownies, 5ish juniors, 5ish daisies. Girls come from various elementary schools in CSISD.