I vaguely remember the story Lesley. Just found this.

So, what was the significance of Mary washing the feet of Jesus with her hair? She was more "spiritually perceptive" than her sister, Martha. She was also more interested in what Jesus had to say and made it her practice to sit at His feet so she could hear every word He spoke in her presence (Luke 10:39).

By acquiring expensive spikenard, anointing His feet, and wiping them with her hair, Mary displayed a devoted and affectionate humility to one she loved deeply and sincerely. Her actions are intentionally in the Bible to memorialize, for all ages, what she did.

Interestingly, Jesus, in less than a week, would wrap a towel around his waist and wash the feet of ALL his disciples, including Judas who would betray him, on Passover night. Our Heavenly Father places a high premium on humility and love, which are both critical in the character of a true Christian.

Still not sure I understand.