Have checked and found no Josephine in my branch of the family tree. I suggest that you check under thee Edmund Gross portion of the family tree. I came from Clement Gross line of descendants. Perhaps she is under Edmund's branch.
Both Clement and Edmund sustained a line, while the younger brother did not as far as I know. If he did, they are lost in time. These 3 were the sons of Isaac Gross who came with him to the new world.