Personally, I don't easily see how Google could be liable for defamation here under any reasonable standard.
Their search services generally don't say the equivalent of "Bob murdered a woman in 1989".
Their search services generally say the equivalent of "Joe says that Bob murdered a woman in 1989".
If anybody is guilty of defamation in that contrived example, it's Joe.
Regardless of whether the story about Bob murdering somebody is true or false, Google's service remains entirely factual when they pass along the word that "Joe says that Bob murdered a woman in 1989". That statement is 100% factual.
I wish the article went into more detail about the actual impact on this woman's career (not sure if they risk lawsuits reporting the details), but as the posted article reads right now, it's not really clear if she was fired because of some boss Googling her, or if she just had a mental break when she fixated on the Google search results to a possibly unhealthy degree.