If by any chance she was married before ...there is only 2 that are possible
there are 18 Martha Jackson on 1891 census born Sheffield
Martha Jackson wife aged 38
in Eccleshall Brierfield, Yorkshire
born Sheffield 1853...............( she has a 4 year old daughter named Martha Jackson as well )
Martha A M Jackson
wife aged 38
in Wath,Rotheram
born Sheffield 1853
allan