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cml750
I'm surprised it hasn't been mentioned yet, but six flags is very close to AT&T stadium. A tour there might be nice.
At that point you're closer to Fort Worth anyway (or at least it seems like it), so yeah I would recommend the stockyards if you want to do 'Texas' things. Rodeo, steak places, bbq, etc. Buy a belt buckle and some dip, feel like a cattle herder. It's great... jk you can skip the dip.
West 7th is also great, but it may not be super family friendly. It's more of a college / adult scene with a lot of bars, but some good restaurants.
On your way back to Dallas (if you're staying there), you could check out the
Bishop Arts District. Some really great food places there [I recommend Lockhart BBQ, Tillman's Roadhouse, Eno's Pizza, or Oddfellows if you're early enough for brunch] as well as small boutqiue shops that your daughter may like.
Have dessert at
emporium pies, because they are pretty awesome. (their address is 314, which just shows you how awesome they are).
There are a lot of things to do. Really just depends on where your hotel is and what's easiest for you.