I both agree and disagree with this. To be respectful of other peoples views, I don't think it should be displayed on the front for the whole world to see. It would be like me walking outside of my house to the street completely buff. It's a time and a place for everything. You go into an art gallery expecting to potentially see things like that. You don't necessarly always want to see them while walking down the streets.
That being said, after she moved it towards the back, I think that's where it needed to stop. She has the right to display that within the interior of the gallery.
Just my 2 cents on it and all.