"She pointed out that the decision doesn't dig into the actual practices of Facebook"
That wasn't actually the ECJ's role. They were asked if national regulators could actually do this given that Safe Harbour was an EC matter. Part of the decision was that they could so it's now been tossed back to the regulator by the Irish High Court. In short it's being done by the people who were supposed to do it.
Apart from that she seems to have got the message. Whether she's in any position to act on it is a different matter. Maybe the poke at Europe was intended to distract from this.
"came as a shock to many policy makers and companies in the United States"
If it did they must have been living in a fools' paradise. What other decision could they have expected? Or didn't they know the case was happening?