Osterman

I'm looking for information on my great-grandmother Mary Elizabeth OSTERMAN or Elizabeth Mary OSTERMAN (I've seen it both ways). She was born September 20, 1880 in Oldenburg to Henry OSTERMAN and Gertrude EMKEN. They emmigrated to the US on November 24, 1913. If there is anyone out there that can give me any insight on any of these individuals, it would be greatly appreciated.