IIRC in Texas you can use the threat of deadly force if someone does not vacate your property after being asked to do so, and if you feel the threat of imminent serious bodily injury or death. That said, this being a census worker, and a woman no less, I can't see the attny being able to get even remotely close to the "threat of serious injury or death" part.
I give her a ten for effort and a zero for application. It won't go well for her.
Brad