Sin is not the only condition in which people obtain grace. Jesus is also described as being "full of grace" (John 1:14) and He did not sin. So your rule does not work with Mary OR Jesus. Besides, it is not credible to suggest that God's messenger called her "full of grace" in order to indicate that she was full of sin. Sheesh. "Where there is no sin, there is no grace because the person is getting what they deserve, not getting what they don't deserve. Grace is only operative when the person doesn't deserve what they are getting."
Not so. Grace doesn't ONLY mean something unmerited. A beautiful Messianic Psalm 45:2-3 describes the Messiah (we know this is Jesus) as having had grace poured upon His lips:
You are fairer than the sons of men;
Grace is poured upon Your lips;
Therefore God has blessed You forever.
Gird Your sword upon Your thigh, O Mighty One,
With Your glory and Your majesty.
The Gospel of Luke speaks of the Child Jesus growing in grace:
Luke 2:40
"And the Child grew and became strong in spirit, filled with wisdom; and the grace of God was upon Him."
You can't say the Messiah was graced because He had sinned!
And look at Psalm 84:11
"For the Lord God is a sun and shield;
The Lord will give grace and glory;
No good thing will He withhold
From those who walk uprightly." Likewise Proverbs 3:34-- "Surely He scorns the scornful, But gives grace to the humble."
These make no mention of the "sin" of the recipient of grace, but focus on the fact thew God will not withhold His grace from "those who walk uprightly" and "the humble."
Happily take into account all of these passages, metmom, which will enrich your understanding of "grace."
And Jesus is full of grace, to be given out.
Believers are given the same grace as Mary. The same word is used in the Greek in Ephesians.
The word grace used in this passage in Luke is used in one other place in the Bible and that is Ephesians 1 where Paul is us that with this same grace, God has blessed us (believers) in the Beloved. IOW, we all have access to that grace and it has been bestowed on us all.
http://biblehub.com/greek/5487.htm
Luke 1:28 And he came to her and said, “Greetings, O favored one, the Lord is with you!”
Ephesians 1:4-6 In love he predestined us for adoption as sons through Jesus Christ, according to the purpose of his will, to the praise of his glorious grace, with which he has blessed us in the Beloved.
Greek word “grace”
charitoó: to make graceful, endow with grace
Original Word: χαριτόω
Part of Speech: Verb
Transliteration: charitoó
Phonetic Spelling: (khar-ee-to'-o)
Short Definition: I favor, bestow freely on
Definition: I favor, bestow freely on.
HELPS Word-studies
Cognate: 5487 xaritóō (from 5486 /xárisma, "grace," see there) – properly, highly-favored because receptive to God's grace. 5487 (xaritóō) is used twice in the NT (Lk 1:28 and Eph 1:6), both times of God extending Himself to freely bestow grace (favor).
Word Origin: from charis
Definition: to make graceful, endow with grace
NASB Translation: favored (1), freely bestowed (1).