Hi there,
I did a quick search of the 1841 census for Jane Marwood born 1830+/- 5 years. There are 9 matches that come up and from this, Marwood appears to be a Yorkshire name. The only match for born in 1830 exact is as follows:
Lund, Easingwold, Yorkshire
Jane Marwood, 11, female servant in the house of a family named Noton. she was born in Yorkshire.
HO107/1240/1