Morning joger, and thank you.
Please do not trouble yourself with 1873, I had overlooked the fact that her birth was probably registered in the overseas register, I will search that.
With regard to Marie Emelia Derick, she was French, born about 1848 in St. Azair, France. This information from various sources, but not verified. She married in London in 1870 and from that wedding certificate comes her fathers name Louis Derick.
Kind regards
Wendi