How odd! My husband's great grandmother on his father's side is a Johanna Frederika Ostmeyer born 1871 in Germany whose parents were Johann Henrich (Henry) Ostmeyer and Henriette Augusta Brinkmann. But I guess my Johanna Frederika cannot be the same as yours because she remained in Germany and maried Johann Carl Andersdotterson and had my husband's grandmother, Marie Wilhemine Andersdotterson who married a Friis. But having both a Ostmeyer and a Brinkmann together, there must be a connection somewhere.
B Briis