Did the angel call her "blessed" and "full of grace"? In Luke the angel says:
Luke 1:26-31 (NASB)
26 Now in the sixth month the angel Gabriel was sent from God to a city in Galilee called Nazareth,
27 to a virgin engaged to a man whose name was Joseph, of the descendants of David; and the virgin's name was Mary.
28 And coming in, he said to her, "Greetings, favored one! The Lord is with you."
29 But she was very perplexed at this statement, and kept pondering what kind of salutation this was.
30 The angel said to her, "Do not be afraid, Mary; for you have found favor with God.
31 "And behold, you will conceive in your womb and bear a son, and you shall name Him Jesus.
Luke 1:26-30 (KJV)
26 And in the sixth month the angel Gabriel was sent from God unto a city of Galilee, named Nazareth,
27 To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin's name was Mary.
28 And the angel came in unto her, and said, Hail, thou that art highly favoured, the Lord is with thee: blessed art thou among women.
29 And when she saw him, she was troubled at his saying, and cast in her mind what manner of salutation this should be.
30 And the angel said unto her, Fear not, Mary: for thou hast found favour with God.
Luke 1:26-30 (YLT)
26 And in the sixth month was the messenger Gabriel sent by God, to a city of Galilee, the name of which is Nazareth,
27 to a virgin, betrothed to a man, whose name is Joseph, of the house of David, and the name of the virgin is Mary.
28 And the messenger having come in unto her, said, `Hail, favoured one, the Lord is with thee; blessed art thou among women;'
29 and she, having seen, was troubled at his word, and was reasoning of what kind this salutation may be.
30 And the messenger said to her, `Fear not, Mary, for thou hast found favour with God;
I don't see any "full of grace" in Gabriel's greeting to Mary. "Blessed," yes, but no "full of grace." In any case, Mary is not described by the angel as having done anything to warrant God's use of her. She is favoured and blessed because God chose her, not because she was particularly deserving of His choice.