Martha Coxon baptised 4/8/1805 Stockport

[garstonite]

Good Morning
a day of doing nothing for me - except - trawling through my familytree
my G Grandad - my nans dad Robert Walker b 1864 Hyde Cheshire
his parents were
James Walker and Jane Allcock - Jane was born 1835 in Stockport
her parents were Joseph Allcock and Martha Coxon
so as the title states above
Martha Coxon baptised 4/8/1805 in Heaton Norris ,Stockport
father John Coxon - mother ????
I HAVEN'T GOT HER MUM - Christian name or surname ?
..............
Joseph Allcock married Martha Coxon 8-7-1833 in Cheadle

so I am trying to find Marthas mum who would be my 4 x G Grandmother - any advice hugely appreciated - thanks for reading
Allan
ADDED
Apologies - I have just checked my tree and I have her christian name as Martha - but no surname