Evil by association perhaps? The worst this woman did was use Myspace to see what people were saying about her daughter. There must be thousands of good willed mums around the world who do the same, I know one for sure. For this she deserves to be asked to leave the neighbourhood by her neighbours?
Bah. That's wrong. The mother was part of this. And it was not simply to 'spy' on the other girl.

Ms. Drew had told a girl across the street about the hoax, said the girl’s mother, who requested anonymity to protect her daughter, a minor.

“Lori laughed about it,” the mother said, adding that Ms. Drew and Ms. Drew’s daughter “said they were going to mess with Megan.”
http://www.nytimes.com/2007/11/28/us/28hoax.html

You make to much of the fact that what she did is not technically illegal.

That in no way means she did no wrong.

And you think people asking that she leave is wrong? Bah! If she had not set up the myspace page to mess with the poor girl, she would still be alive. She set the events in motion and she set the stage for her daughter to torment the deceased.

CR