This may possibly be her parents on 1851 census
1851 Census HO107/1498/463/39
Residing at 1 Laybourne Street, St Pancras
NEWMAN John Head Married 30 years Porter b. Bulkington Wiltshire
NEWMAN Amelia Wife Married 24 years b. Aston, Oxfordshire
NEWNAN Martha Ann Dau 1 month b. St Pancras, Middlesex
Births Mar 1851
NEWMAN Martha Ann St. Pancras 1/356
Deaths Dec 1851
NEWMAN Martha Ann St Pancras 1/256
The birth certificate of Martha would give you more information ie if it is Mary Ann's parents.
Cando