Luke 1:29 But when she saw him, she was troubled at his saying, and considered what manner of greeting this was. 30 Then 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 bring forth a Son, and shall call His name Jesus.
Anyone would be troubled if an angel were to show up and interrupt their daily routine. So of course Mary was troubled and puzzled to receive such a greeting from the angel Gabriel. The angel told her not to fear and that she had found favor or grace with God. The grace of God is not something that comes from within Mary but is something God gives her. Mary is told that she will be with a Child, a Son, and to name Him Jesus which means “God is salvation.”