John 20:15

Jesus saith unto her, Woman, why weepest thou? whom seekest thou? She, supposing him to be the gardener, saith unto him, Sir, if thou hast borne him hence, tell me where thou hast laid him, and I will take him away.

Mary's failure to recognize the Lord is not a problem, for her attention was focused inwardly upon her own grief, from which not even the angels of God could divert it. Jesus asked exactly the same question as the angels, but with the additional question, "Whom seekest thou?" Some power beyond herself was required to break her soul out of the power of the smothering grief that overwhelmed her; and that power Jesus at once provided.