Looking for Judith de Mouilpied

We have a request from a cousin looking for Judith de Mouilpied, born 1808 in St. Martin, Guernsey. She says:

I have been researching my ancestors for about two years now.  My maternal Great Grandfather, Arthur Le Patourel,  was born in St. Peter Port, Guernsey in 1881.  His paternal Great Grandparents were Daniel Marquand Le Patourel and Judith de Mouilpied.  I have traced the Le Patourel family history, on Guernsey, back to 1550 but, unfortunately, I have been unable to find out more about Judith de Mouilpied.  

All I know about her is that she was born in St. Martin in 1808.  Judith and Daniel had six children; Rachel (Patty) who was born in 1831, Daniel b.1836, Mary b.1838, Susan b.1841, Peter b.1845 and Henriette b.1848.

Do you have any idea who Judith's parents were? Does anyone have access to the St. Martin's records?

Can you help?  Please contact me!  Thanks.