Where have you got her maiden name from?
I see in 1851 (they’re in Aveton Gifford in Kingsbridge RD) there are daughters Mary J, 9, and Emma, 7,
Are these their birth registrations?
Mary Jane Jeffery mmn Jeffery, Sep qtr 1841 Kingsbridge
Emma Jeffery mmn Jeffery, Dec qtr 1843 Kingsbridge