please POST the original KOINE Greek text and the provenance of your test.
Luke 1:28 καὶ εἰσελθὼν πρὸς αὐτὴν εἶπεν Χαῖρε, κεχαριτωμένη,
Luke 1:28 And the messenger having come in unto her, said, 'Hail, favoured with grace, the Lord is with thee;
There is no "full" in there. The Greek word for "full" is plērēs and is used in Acts 6:8
Acts 6:8 Now Stephen, a man full (plērēs) of God's grace and power, performed great wonders and signs among the people.
The Greek word plērēs is NOT used in any reference to Mary nor can it be extrapolated from any word used addressing Mary.