Gusburn in Yorkshire above Halifax and Keithley
(over the tops is Gisburn in Lanc's)
In IGI b1813 Ellen Brearley Gisburn Yorkshire. and was OTP on marriage.
With the 1804/5 being april year start those days
and Your Ellen age 41 in 1851 with exact age in months could be 1810 with estimated could 1809.
With nothing turning up and the illiterate people round then and 'about age' (Verble) as the clerk could only write what he told and not unusual to bring ages near at marriage. (She Lied To Benny)
1804 bapt location Longwood?

? strong coincidence!!
My G-Granny (Direct)
gained 5 years from marriage 1867 age 20 to her death 1902 age 60. with an uncommon name (No Others) Tidmarsh.
I would reconsider her. read about ages at marriage those days.
There nothing in Scammadon, Stainland or Ripponden All Halifax/Huddersfield IGI hugh Wallis surounding areas or
BDM None conformist neither.
A look up for a known date is fairly easy but the number of sub parish in a 20 mile radius area of Huddersfield f/fiche search could take years.