From Spiegel:

Merkel still gets animated when talking about American surveillance, but only when the cameras are off. In the Rose Garden last week, she remained just as vague as Obama did, preferring to speak of "differences of opinion." But there are to be no immediate consequences.

The reason is not difficult to pinpoint: The Ukraine crisis. With the situation continuing to escalate, Merkel is eager to demonstrate unity with Obama and the two threatened Russia with further economic sanctions. But the solidarity comes at a price: Merkel has had to back away from some of her own convictions.