I don't think she will do full on nudity unless it has a special meaning in a song that she wrote and is played in an artistic way.
I watched an interview where she showed a shirt that hardly showed any skin and said "This is as naked as i get." I really love and respect her for not giving into that because all of the other music videos have it. Yes she took off her skirt, BIG DEAL! shes 27 years old, it's legal for her to do much more worse things than taking off a skirt, and i truly thought that brought a lot more drama to the song.