This is the only text that mentions Mary Magdalene, pre-crucifixon and there's no adultery or prostitution here.
"After this, Jesus traveled about from one town and village to another. The Twelve were with him, and also some women who had been cured of evil spirits and diseases: Mary (called Magdalene) from whom seven demons had come out—and many others. These women were helping to support them out of their own means.— Luke 8:1-3"
Some people blend Mary of Bethany with Mary Magdalene and the sinful woman of Luke 7:36-50, which causes a bit of confusion but suffice it to say that Mary Magdalene was NOT an adulteress or a prostitute or any sort of woman.
He didn’t cast out the devils more than once. After that she trusted Jesus.