I've just looked up the Museum's website. The show is called
Pretty Baby, and Mann's work is (was?) only a part of it. Here's the full quote:
"In the 1990s, the artist Sally Mann was met with a different type of criticism because the children in her images were her own. Mann began photographing her three children in 1984 for what would be published in 1992 as a monograph entitled
Immediate Family. The first picture in the series,
Damaged Child, shows a close-up view of the artist's young daughter Jessie, then two years old. In the image, the child's left eye is inflamed, suggesting a range of interpretations, from child abuse to what was strictly depicted: the child's temporarily "damaged" face, swollen from insect bites. Like
Damaged Child, all of the formally beautiful pictures in Immediate Family present several possible readings. And undoubtedly, in showing her children naked, moody, and in suggestive situations, Mann evokes an edgy, dark side of childhood. At its debut,
Immediate Family was met with a mix of praise and discussions of parental rights, exploitation, and childhood consent. Although Mann's work is not included in
Pretty Baby, undoubtedly her images of children have been influential to the Western artists in the exhibition."
So it's the ambiguity and the misinterpretation it can lead to that they were talking about. It's worth reading the rest of their text, as the whole exhibition is designed to explore the controversy around child photography.