A Margaret Penn marries Edw. Anderson at Baldock in 1834.
This was on 18 May 1834 - marriage record available on FindMyPast
on 1841 census at Baldock Edward Anderson 1801 & Margararet 1811, where as well as son Ezekial 1838 there is a 8 year old Ann Pate ?
on 1851 in Norton, Margaret Anderson, widow b 1815 Baldock (Edward buried 8/10/1849)
June qtr 1860 Hitchin RD Margaret Anderson married James Walker
on 1861 in Baldock, James Walker 1810 & Margaret Walker 1812 Baldock
If you get the 1860 marriage cert it might tell you her father.