Hi everyone

Was wondering if anyone would be kind enough to lend me any advice or help to find out more about the most interesting person I've uncovered in my family's history (so far!).
My great-great grandmother was called Elizabeth Durkin (married surname), she was born in about 1863, and her place of birth is listed as the West Indies on the 1901 census, and India on the 1911 census! The possibility of having Caribbean or Indian blood is brilliant - exactly the sort of "jackpot" unexpected thing you hope to come across when looking into your family's history - but other than these census entries I've been unable to find out anything about her.
Her husband was Lawrence Durkin (born in Ireland, ~1863), and a relative said that he might have been in either the Indian Army or affiliated with the East India Company. It might be coincidence, but the common (West) Indian thread invites me to speculate that he met her far afield, married her and brought her back to Lancashire, England... A rough timeline of what I've pieced together from censuses is below.
1881 - Lawrence Durkin is aged 19, living with his mother Bridget in Blackburn, Lancashire.
Some time between 1881 and 1891 - Lawrence meets & marries Elizabeth. I don't know for sure, but I doubt that there would be many (West) Indian girls in Blackburn at the time...
1891 - Lawrence Durkin is aged 29, living with Elizabeth aged 28 with their four childen in Burnley, Lancashire.
1901 - Lawrence and Elizabeth are both aged 39, living in Padiham Lancashire with their surviving three children.
1911 - Lawrence disappeared from censuses (he died in 1913, so might have been in hospital). Elizabeth (listed as "Lizzie", aged 50) living with the family of Lawrence's oldest child.
If anyone could suggest a way forward to find out more about Elizabeth I would be truly grateful. If I could even find out her maiden name it would be a massive help...
Best regards,
Sean.