The last time we see Mary Magdalene in the Bible, Jesus says to her, “[G]o to my brothers and tell them, ‘I am going to my Father and your Father, to my God and your God'” (John 20:17).
She did exactly that and proclaimed to them, “I have seen the Lord!” After that, the rest of the Bible is silent in regards to where she went and what she did.
However, there are varying traditions that give some possibilities as to where she went after Jesus’ resurrection.
The medieval text known as the Golden Legend paints Mary Magdalene as a preacher. For example, it gives one story where Mary Magdalene teaches some pagans about Jesus Christ.