Yesterday, writer Stephen Leigh (sleigh) noted in this post that the book was put together by a book packager. I suggested in one of my replies that it was entirely possible that the packager was the one who really committed the plagiarism. (Still, Viswanathan would have to take full responsibility, since it is her name on the book.)
Well, there are two articles I found today that would appear to substantiate my theory.
First, today's New York Times article "A Second Ripple in Plagiarism Scandal" points out that some passages in the Viswanathan novel were lifted from yet another book, implying that the plagiarism was deliberate.
Secondly, the Harvard Independent article "Kaavya Case Not First Plagiarism Controversy for Opal Mehta Packager" points out that the packager had been found guilty of committing plagiarism before.
Methinks the packager is mostly at fault, but as I said before, Viswanathan has to take responsibility as well.