Ellen's 1876 death record stated that she was 56 yrs old giving her year of birth as 1820. The informant was not a member of her family. However she married in 1833 so it very unlikely that she was only 13 yrs old when she married. There appears to be no baptism record for her in the Parish register. Ellen's parents were probably married before 1810 as their 1st recorded child was in 1811 but their last was 1833. However, there were no children for this couple baptised between 1811 & 1816 so perhaps her baptism was not recorded.
So what's the best guess on her year of birth?