Feedmysheep, I think that your friend was mentioning where, in Her apparitions, Mary’s feet are usually seen…there is a precedent for this.
In Her apparitions on Tepeyac Hill, Our Lady of Guadalupe’s feet were seen crushing a serpent. When Our Lady appeared to Bernadette Soubirous in Lourdes, France, Bernadette stated that she saw a golden rose on each of her feet.
I hope that this start helps.