According to the NY Times article, these were offending art pieces: (link below)
"Ms. McGee passed the marble torso of a Greek youth from a funerary relief, circa 330 B.C.; its label reads, his nude body has the radiant purity of an athlete in his prime. She passed sculptor Auguste Rodins tormented Shade; Aristide Maillols Flora, with her clingy sheer garment; and Jean Arps Star in a Dream.
http://www.nytimes.com/2006/09/30/education/30teacher.html?pagewanted=print
And performance issues brought to her attention in May were not displaying enough of the children's artwork and wearing "flip flops" which were actually Via Spiga sandals (expensive and very tasteful)