J.,
I also live in the North Ft. Worth area and spent some time searching for a working mom's group. My friend and co-worker actually started a mom's group, but it's in Denton. We usually meet twice a month, once for a girls only event (dinner, movie, pedicure) and once for a family event. Our girls only events are typically Monday evenings around 7 so that us working moms can make it.
We are meeting this Saturday for a family event at a park in Denton. If you would like more information on the group you can visit http://moms.meetup.com/975/
If you do find a mom's group closer to our area, could you please let me know. I really like my Denton moms group, but it is open to all moms (we didn't want to exclude) so there are several stay at home moms that have joined. It's a really fun, active group, let me know if you have any questions.
Thanks
S.