This description of Mary, Sister of Lazarus is from Easton's Bible Study.
Mary, the sister of Lazarus, is brought to our notice in connection with the visits of our Lord to Bethany. She is contrasted with her sister Martha, who was "cumbered about many things" while Jesus was their guest, while Mary had chosen "the good part." Her character also appears in connection with the death of her brother (John 11:20,31,33). On the occasion of our Lord's last visit to Bethany, Mary brought "a pound of ointment of spikenard, very costly, and anointed the feet of Jesus" as he reclined at table in the house of one Simon, who had been a leper (Matthew 26:6; Mark 14:3; John 12:2,3). This was an evidence of her overflowing love to the Lord.
Nothing is known of her subsequent history. It would appear from this act of Mary's, and from the circumstance that they possessed a family vault (John 11:38), and that a large number of Jews from Jerusalem came to condole with them on the death of Lazarus (John 11:19), that this family at Bethany belonged to the wealthier class of the people.