In 1851 there's a Mary Spendlove, aged 18 (born 1833) living in the household of a Thomas Smith, aged 62 and his wife Sarah in Belper - only about 4 miles away from Turnditch, as a servant. They were both born in Shottle.
Is this her?
I see there is another Mary born in 1833 to a William Spendlove, so this may be her.
Do you know if she was still alive in 1841?
There are a couple of deaths of Mary Spendlove in 1840 and 1841 in the Belper registration disctrict. Unfortunately, no age given on the indexes on findmypast.