I’m having my assistants research this question. In the meantime, can you offer some clarification: Do you mean the statue along the driveway to the South of Bapst, or the one in the niche on the north side of the building (facing Comm Ave.)?
Update 6/6/19: If you mean the one along the driveway, yes, that’s St. Mary. The significant iconographic detail is her foot on a snake (bit.ly/mary-snake). A shrine in that location seems to have been planned by Senior Sodality in 1948; the earliest existing photo that could be found is in the 1951 Sub Turri (bit.ly/bc-sub-turri-1951), but that seems to be a different statue. It is unclear when that one was replaced with the current one, which does not have a plaque.