L.C.
Target sponsors free kids days at the local musems so check your papers during that week.
aquarium in dallas my kids loved it! the family went at thanksgiving break one year so we had all age kids and all of them liked it!
Ice skating rink in the mall in Arlington.
San Antonio:
Everyone likes Six flags and don't get me wrong it is fun there, but as a group with that age range go to Sea World instead, they have rides there too.
Wax museum: there are other attractions you can buy tickets for and if you get the whole package it is worth it my kids loved it!
Make sure you go to the children's museum, this is all downtown.
SA zoo is nice.
Make sure you eat at Salt Grass.
Make sure she gets some brisket from Rudy's, my husband was just there for his job and I made sure he brought me some brisket back! it's just not the same here!
If you stop in Austin on your way to SA. Go to Austin Park and Pizza.