When Gabriel visited Mary, she was, as is usual when meeting an angel, troubled by it:
In the sixth month the angel Gabriel was sent from God to a city of Galilee named Nazareth, to a virgin betrothed to a man whose name was Joseph, of the house of David. And the virgin's name was Mary. And he came to her and said, “Greetings, O favored one, the Lord is with you!” But she was greatly troubled at the saying, and tried to discern what sort of greeting this might be.—Luke 1:26-29 (ESV)
But it's odd that she should need to interpret what "sort of greeting" Gabriel was bringing to her. Why didn't she understand, without needing any special discernment, that the message was one of good news? Is there some other way that Gabriel's words could have been interpreted?