Apparently Mary was from Somerville! According to the article, Mary’s family owned a farm in Sterling, MA and one of the ewe’s had twin lambs. The ewe wouldn’t feed one of the lambs, so Mary took it in and cared for it herself. The lamb thought Mary was her mother and followed her to school.
When Mary was older and got married, she moved to Somerville (to a home which is now the Greek Orthodox Church on Central street for those of you familiar with the area).