Jamieson, Fausset and Brown on Mark 16:9

9. Now when Jesus was risen early the first day of the week, he appeared first to Mary Magdalene, out of whom he had cast seven devils--There is some difficulty here, and different ways of removing it have been adopted. She had gone with the other women to the sepulchre (Mr 16:1), parting from them, perhaps, before their interview with the angel, and on finding Peter and John she had come with them back to the spot; and it was at this second visit, it would seem, that Jesus appeared to this Mary, as detailed in Joh 20:11-18. To a woman was this honor given to be the first that saw the risen Redeemer, and that woman was NOT his virgin-mother.