Was Grace adopted? If not I can't see the connection between Grace and Olga.
WOODHEAD, OLGA JANE - WILSON
GRO Reference: 1887 M Quarter in WORKSOP Volume 07B Page 44
Deaths Jun Qtr 1887
Woodhead Olga Jane 0 Worksop 7b 28
Births Jun Qtr 1895
Woodhead Olga Nesta Conway 11b 500
Olga M Woodhead
Event Type Census
Event Date 31 Mar 1901
Event Place Llanrhos, Caernarvonshire, Wales
County Caernarvonshire
Civil Parish Llanrhos
Ecclesiastical Parish Eglwys Rhos
Sub-District Creuddyn
Registration District Conway
Gender Female
Age 5
Relationship to Head of Household Daughter
Birth Year (Estimated) 1896
Birthplace Glanconway, Denbighshire
Schedule Type 213
Page Number 38
Alfred Woodhead Head M 39 Hale, Cheshire
Mary E Woodhead Wife F 38 Church, Lancashire
Olga M Woodhead Daughter F 5 Glanconway, Denbighshire
Nina L Woodhead Daughter F 2 Deganway, Carnarvonshire
James Dickmont Visitor M 26 Church, Lincolnshire
William Dickmont Visitor M 19 Accrington, Lancashire
George A Turner Visitor M 24 Manchester, Lancashire
Alice ? Servant F 28 Chester
Deaths Mar Qtr 1973
WOODHEAD OLGA NESTA 12AP1895 EASTBOURNE 5H 1046
That now poses a problem with those two deaths.
Back to the Olga who married Philip. ???
No other Olga Woodhead born 1885 - 1895 in England in index.