How did she get through TSA without a drivers license?
A very good question. How DID she get from Texas to DC without ID, given that both Amtrak and air transport both require ID? Did she come by private plane?
Her story about her parents being "too busy" also rings false. She's over 18, a legal adult. She does not need her parents to come with her, she just needs to somehow get to DMV (bus, cab, or a friend with a car).
I think that's an interesting question. But, the TSA doesn't require an ID to fly:
I'm guessing that she was escorted to DC by the opponents of this law, and the DoJ gave her what she needed to get past the TSA checkpoint.