Hi
On her first two marriages she married a bachelor but what do you know of Edwin Thorne because of course this may not have been his first marriage?
Marriages Jun 1899
Thorne Edwin George Newport M 11a 343
Yates Alice Louisa Newport, M. 11a 343
On the 1901 census Edwin was 46 so a little old for a first marriage.
1891 census RG12 4382 folio 25
Bryn ? Terrace Mynyddyslwyn, Monmouthshire
Edwin G Thorne 36 Head Married General Labourer St Michael Creech Somerset English
Maria Thorne 43 Wife Married St Michael Creech Somerset English
Maud Mary Thorne 12 Daughter Winston? Somerset English
Edward Harold Thorne 10 Son Kingston Somerset English
plus 1 lodger
Deaths Sep 1898 Thorne Maria 52 Newport, M. 11a 129
So there was a step brother.
1901 census RG13 4936 folio 77
39 Powell Street Abertillery Monmouthshire
Edwin Geo Hanny 28 Head Married Insurance Agent Risca Monmouthshire English
Maud M Hanny 22 Wife Married Kingston Somerset English
Edward H Thorne 20 Boarder ? ? Builder Powberton, Somerset English
Alice was 39 on the 1901 census so still capable of having further children. Have you checked the 1911 census to see if she did?
Unfortunately the question on children asked on the 1911 census is only relevant to Alice's last marriage so won't supply information on any other children she may have had with her other two husbands.
'In the 1911 census women were asked to state the ‘years the present marriage has lasted’, the number of children born alive to the present marriage (not just those who were living in the house) and how many had died.'http://www.1911census.co.uk/There doesn't seem much space between Alice's marriage to James Yates and another possible child being born unless you are suggesting she was pregnant at the time on the 1891 census or had a child subsequently by another man? That could be one reason for why she ended up in Monmouthshire?
1891 census RG12 481 folio 34
236 Camberwell Road Camberwell
Alice L Yates 29 Head
Widow Living on own Means Paddington
William Shaw 9 Step son Lambeth London
Alice E Yates 9 months Daughter Peckham London
Do you know when James Yates died? Does Alice's birth certificate indicate he was still alive at the time of her birth?
Regards
Valda