i found information on MARY ALLERTON she was maried to Issac Allerton here's what i found Three women, Mrs. Susanna White, Mrs. MARY ALLERTON, and Mrs. Elizabeth Hopkins all boarded the Mayflower at least six months pregnant. Elizabeth would give birth to a son Oceanus while the Mayflower was still at sea. Susanna White gave birth to a son Peregrine on the Mayflower while it was anchored in Provincetown Harbor. Perhaps the rough voyage had already taken its toll on MARY ALLERTON, who gave birth to a stillborn son on the Mayflower while it was anchored in Plymouth Harbor. A fourth woman, Mrs. Sarah Eaton, came to America with a "sucking child", Samuel Eaton. Both MARY ALLERTON and Sarah Eaton died the first winter. Susanna White's husband William died, and she remarried Edward Winslow, whose first wife Elizabeth had died that winter as well.
Pilgrims who Died the First Winter
Women Mrs. Elizabeth Winslow Mrs. Dorothy Bradford Mrs. MARY ALLERTON Mrs. Rose Standish Mrs. Mary Martin Mrs. Alice Mullins* Mrs. Ann Tilley Mrs. Joan Tilley Mrs. Thomas Tinker Mrs. Alice Rigdale Mrs. Susanna Chilton Mrs. Edward Fuller Mrs. Sarah Eaton Mrs. Katherine Carver