I think I may have solved it, but please feel free to disagree.
I took a punt and ordered the marriage certificate of Ernest Walter Reeves and Sarah Miriam Russ they married 05 Jan 1918 at Cardiff registry office. He was a Private age 23 in the South Lancashire Regiment, his address was 16 Station Road, her's was 14 Station Road (she was age 24). His father was Frank Reeves a farm Labourer, hers was Charles Robert Russ a Blacksmith.
Thank you for posting the details - her baptism is on Anc*y
Miriam Sarah RUSS
Born 24 Oct 1891Baptism 6 Dec 1891 Warrington, St. Elphin
Father
Charles Robert Russ, blacksmith Mother
Eliza Elizabeth image on Anc*y
Not sure but her birth may have been registered as Miriam Elizabeth Russ

RUSS,
MIRIAM ELIZABETH mmn
HUNT GRO Reference:
1891 D Quarter in WARRINGTON Volume 08C Page 244
1891 census
Piece 3738
Folio 8
Page number 7
20 Monmouth Street, Salford
Charles Russ 37 Head
occ blacksmithEliza 35 Wife
Alice M 15 Daughter
Mable E 13 Daughter
Eliza E 11 Daughter
SARAH M 9 Daughter born
Warrington, Lancashire
Minnie 7 Daughter
May 4 Daughter
Mary H 1 Daughter
1911
SARAH Russ is with her parents
Charles Robert & Eliza Elizabeth Russ plus siblings living 87 New Park Rd Salford, her parents are still in Salford in 1921
Image to view on Anc*y
Marriage 17 Aug 1884 Mangotsfield, St James, Gloucestershire
Charles Robert
RUSS 22
blacksmith Father John Russ, haulier
Eliza Elizabeth
HUNT 20 father William Hunt, haulier
Charles age 63 remarried 15 Sep 1928 Ordsall, St Cyprian Salford, Lancashire - image on Anc*y
I can’t find a death for Sarah Miriam
I've not found anything either

There is a death Jun 1982 Sandwell for a Sarah Reeves
dob 26 Oct 1891 but I think she was nee Marson and married William Simms Reeves