The Melania attacks actually started from the #Cruz camp (March 8). Cruz campaign against Trump starts At 4:00 mark:
https://www.youtube.com/watch?v=ALErcfr7jQ0&feature=youtu.be
Notice how Neil was saying "you guys" referencing how the Cruz campaign handled the Rubio quiting rumors and she accepted that designation and responded pretty much as a spokesperson.
Certainly if she was not really part of the Cruz campaign and misrepresenting herself, they would have jumped on it.
I am not happy with the way Trump finally struck back. But the narrative that it wasn't Cruz that struck first and it was just a super PAC ad he had no control over is nonsense.