Can you provide any further information? Possible location of birth of either Emma or her husband?Place and date of marriage?
At the 1850 census of Newburgh, NY, a Daniel K. Calyer (or, Colyer), born about 1805 in NY, wife Maria, had 5 children, "Emma," age 2, being one. I cannot say for sure that this was "your" Emma, however.It is possible that Daniel was a descendant of Jochem Caljer of New Amsterdam.I do find in a genealogy of that family a Daniel b. August 20, 1805, probably in Bushwick (a section of Brooklyn, I believe) son of Charles Calyer and Catherine Shute.Without some further solid information, we can't say that this was the Daniel who was in Newburgh in 1850.
Daniel Calyer was in Newburgh in 1870 and 1880. I don't yet find him in the 1860 census, when Emma would have been about 12 years old. She was not with the family by the 1870 census.
A complicating factor is that in at least the 1880 and 1900 censuses of Newburgh, an "Emma A. Calyer," born about 1849, lived there, wife of Isaac C. Calyer. Is it possible that William Hubbs was a 2d husband of Emma??