This article has a few more details
http://www.dallasnews.com/sharedcontent/dws/news/city/collin/frisco/stories/DN-nakedcomplaint_24cco.ART0.North.Edition1.3e87f61.html
There were other issues that led to her firing, not just the field trip.
"District officials say they are supporting a principal who reprimanded Sydney McGee over the field trip and other performance issues."
Not just parents, but other teachers also complained about the trip and it wasn't just nude sculptures.
"In a memo to Ms. McGee, Ms. Lawson wrote that students were exposed to nude statues and other nude art representations during the trip. Ms. Lawson said she received complaints from parents and other teachers about the trip."
This was also missing --
Ms. McGee, who has taught in various Texas districts for 28 years, said she visited the museum and spoke with museum staffers before the trip to ensure that it was appropriate for the fifth-grade class. Ms. McGee said she does not know which piece of art offended the parent, and the district did not identify it.
it wasn't just nude sculptures.
Ah, you're right. It was also nude paintings. String her up!
It's still a pathetic response from these parents.