Your Margaret Gilbey appears to be an ancestor in my family tree. Although I have no follow-up information on her beyond the 1881 census where she was living in Little Sampford, Essex. New Sampford is the local name for Little Sampford.
Her parents were Philip Gilby, (no E), born 1822 Great Sampford, Essex died 02 Jun 1886 Little Sampford and Mary Sorrell born 1837 Hempstead, Essex and died 1884 Saffron Walden, Essex registration district. Mary Sorrell was the second wife of Philip Gilby. I am aware that Margaret had 7 siblings and 5 half-siblings. Her ancestry can be traced back to c1709 in Finchingfield, Essex.
If you have access to Ancestry.com you will be able to find full details on my public tree, The Gilbey family tree.