Dear Xin, thanks for your efforts on my behalf. Mary was born (in Germany or France) in 1785 and died in Hinckley in 1865. We do not know when or where she got married (definitely not in Leicestershire, we checked) but her husband William had already died before 1841. By the way, the name is sometimes also spelled JAQUES. Best regards ! PS I am not a member of Ancestry, unfortunately.