(Of course, this depends on what she was sending, if it was really protected information, and who she was sending it to. If she was sending evidence of criminal wrongdoing on the part of Google to her lawyer or a government official, then I don't know).
Probably because she was worried that something exactly like this would happen.
I remember an all hands where someone forwarded a relatively innocuous email to her Yahoo, once, and we all received a big reminder.
So a question is then whether it’s morally sufficient for someone to be fired for this sort of behaviour. It feels to me like the reason for the firing was not really at all related to breaking the written policies in the company handbook and a lot more related to breaking the unwritten policies about stirring up trouble and dissent.
Also worth noting is that from a PR perspective, the press doesn't seem to be interested in anything other than making Google look bad, which strengthens my view that they are narrative creators more than anything.
I guess I just don't trust unclear language that emanate from within big corporations somewhere.