She married Robert MILLS and together they had a child Elizabeth born in 1897.
In the 1901C, Robert (58) and Alice (34) were living in Hammersmith with their child.
Robert must have died, for in 1912 Alice married Charles IZZARD.
when and where did she marry Robert MILLS,
I can't find a marriage for Robert MILLS to Alice BIRCH c1891-1897

Did they marry?

Is it possible either he or she was previously married?
1901 Piece: 45 Folio: 128 Page Number: 21
57 Angel Road
Robert Mills 58 Hammersmith,
occ railway checkerAlice Mills 34
Elizabeth Mills 4
Frederick Mills father 80 St Giles London, living on own means
Have you considered this death entry for Robert ?
Robert Mills Age: 66
Dec 1908 Brentford, Middlesex, United Kingdom
Volume: 3a Page: 48
There is this Robert Mills whose pob given as Hammersmith 1871/81
1871 Piece: 9 Folio: 39 Page number: 69
Robert Mills 28 Hammersmith occ
Railway PorterEsther 22 Devizes Wilts.
1881 8 Cuthbert St., Kensington
Robert Mills 33, Hammersmith occ
railway porterEsther 30 Devizes
Not found this couple on 1891 & 1901 census
Mmm….maybe not the Robert Mills you are looking for he married
Esther Martin in 1868 Paddington his father named as
JAMES on m/c , they can be found on 1851 census
Piece: 1469 Folio: 514 Page 34
James Mills 33 London, Labourer
Elizth Mills 28
Robert Mills 9 HammersmithJs Orchard sister 22
Have you found your Robert Mills any other censuses?