Here's my thoughts.
1861 census:
Address: Work St, Poplar, Middlesex
George A. LEWIS Head Widower 63 Shipwright born Rotherhithe
Mary A. LEWIS Daughter 30 born Middlesex Poplar
James E. LEWIS Son 23 Shipwright born Poplar
Emma L. DRISCOLL Granddaughter 5 Scholar born Middlesex Stepney
From the above census and Mary being deceased, I found Mary Ann Phillips, born 14 September 1803 in Lambeth her father being John Alexander Phillips. Then Mary Ann Lewis death September 1854 Rotherhithe. I only found that Mary Ann going by the daughters name.
Just a thought
