Mary the mother of Jesus plays a huge role in the early gospel story (obviously). She then pops up occasionally in the gospel stories, during Jesus's Galilean ministry and again at his Crucifixion. She was with the disciples between Jesus's ascension and the Pentecost.
Then she vanishes and is never referred to ever again in the bible. Acts 1v14 is the only reference to her outside of the gospels. Paul never mentions her, Peter never mentions her, James (supposedly her own son) never mentions her.
Where did she go?
As it happens, no other Mary is referred to outside of the Gospels either...