The Crugers of Boscobel were the family John Peach Cruger and his wife Eliza L.C. Dyckman. They had a large family, none named Marian, and all are accounted for in family and Bible records. However, one of John Peach Cruger's sons, John Whetten Cruger by name married a Frances E. Rusher and had a son by the name of William Rowland Cruger (born 1863 in New York City). William had a daughter Marion or Marian Cruger, born in about October 1889. He also had a son William Rowland Cruger, Jr., born in about Oct. 1892. William and his family (including his father John W. Cruger) are recorded in New York City in the 1900 Census (168 W 107th St., New York City, NY County NY, ED 554, Sheet 9). This may be the "Mirian Cruger" you seek. I would be interested in knowing, as I have researched the Cruger for many years.