I think you're right, Janet. The article itself makes it clear that it was due to an imbalance of medications for her bipolar, not the bipolar itself.
I do agree, though, that it is important to be careful to not vilify illness. I don't see that happening here, although the line is very close. Newspaper articles are often going to cross that line, unfortunately, in their search for sensation-mongering to boost readership. Research articles, on the other hand, should always be written with much more care.
Frankly, for a newspaper article, this was remarkably supportive while still giving full information on the incidents.
There is nothing wrong with using the word "blame" in this context, because there really wasn't an alternative way to express it (other than Janet's suggestion). "Blame" is still needed because that connotation can't be avoided.
Marg