1) Mary is called "full of grace" or "most favored one" (your choice!) BEFORE Christ was conceived ("thou SHALT conceive in the thy womb"), born, died and resurrected. We can argue whether she was saved right at this moment of the Annunciation or she was prepared as a pure dwelling place for the coming Christ from her first moment of her own conception but one thing is clear... she wasn't waiting (like the rest of us) for salvation.
2) Mary was greatly troubled by the greeting of the Angel. Note that it doesn't say she was scared of the Angel, she was troubled by his greeting. There is something powerful in the greeting (whatever translation you use) and she recognized it enough to be troubled that she should be called "full of grace" OR "most favored one".
I was pointing out that the approved USCCB NABRE does not use “full of grace.” Perhaps you could find out why they chose to change the English use of words from the DRA.