Art Teacher Fired in Frisco, Texas for Showing Students... Art?

What exactly is going on in Texas schools?  It's well-known that Texas is  hardly seen as the voice of enlightenment in the free world, but lately  things have just gotten ridiculous.

In Frisco, Texas, a upscale city outside of Dallas, an art teacher was fired  from her job after taking a class of fifth graders to an art museum.  Sydney  McGee had been working for the state for 28 years, and her name was  synonymous with skill, education and integrity.  Parents moved their  families across town so that their students would have the opportunity to  learn under her tutelage.  She had been teacher of the year on more than one  occasion, and had been commended countless times for exemplary performance.   What could a teacher do that was so horrific that her past experience was  null and void, and she was too great a threat to the students to remain in  her position?  She took them to the Dallas Museum of Art.

Wait, you're saying.  That doesn't make any sense.  Well, no, it doesn't, at  least not in the civilized world.  But this is Texas, and, more  specifically, north Dallas, and the rules about education and civil  liberties that apply to the rest of the world don't apply here.