For she ran to Peter and John, and instead of announcing to them that the Lord was risen, told them that he had been taken from the tomb.
Therefore, she did not yet know about the resurrection.
[...] The good news of the resurrection of Christ was received from the Lord first, before all others, by the Theotokos [the Mother of God].
This is truly meet and right. She was the first to see him after the resurrection and she had to joy to hear his voice first.
[...] Mary Magdalene and the other Mary – who was, of course, the Mother of the Lord – went to look at the sepulchre.
And behold there was a great earthquake: for an angel of the Lord descended from heaven, and came and rolled back the stone from the door of the tomb and sat upon it.
His countenance was like lightening and his raiment white as snow. And for fear of him the guards did shake and become like dead men.
The other women came after the earthquake and the flight of the guards, and found the grave open and the stone rolled back.
The Virgin Mother, however, was there when the quake occurred, when the stone was rolled back, when the grave opened, and while the guards were there, even though they were completely shaken with fear.
That is why the guards immediately thought of fleeing when they came to from the earthquake but the Mother of God rejoiced without fear at what she saw.
I believe that the life-bearing grave opened first for her. For her and by her grace all things were revealed for us, everything that is in heaven above and on the earth below.
For her sake the angel shone so brightly so that, even though it was still dark, she saw by means of the bright angelic light not only the empty grave but also the burial garments carefully arranged and in an orderly fashion, thereby witnessing in many ways to the resurrection of the one who was entombed.
He was, after all, that same angel of the Annunciation, Gabriel; he watched her proceed rapidly towards the grave and immediately descended.
He who in the beginning had told her “fear not, Mary, you have found grace with God,” now directs the same exhortation to the Ever Virgin.
He came to announce the resurrection from the dead to her who, with seedless conception, gave him birth; to raise the stone, to reveal the empty grave and the burial garments, so that in this manner the good news would be verified for her.
Gregory Palamas (1296-1359): Homily for the Sunday of The Myrrhbearing Women, translated by Fr. Hierodeacon Photios Touloumes+ from Migne P.G. vol 151, pp 236-248; full text @ Saint Nektarios Greek Orthodox Church.