Lastly, for now, I would think it worthwhile checking the following, as all have been indexed with same reference number. Whilst various surnames are indexed, none being Smith, given age and location, it might, however unlikely it seems, still be the 'missing' Elizabeth:
SIM
ELIZABETH
34
F
1919
168 / 1 / 557
St Nicholas
CATTO
ELIZABETH SIM
34
F
1919
168 / 1 / 557
St Nicholas
FACHIE
ELIZABETH SIM
34
F
1919
168 / 1 / 557
St Nicholas
MILNE
ELIZABETH SIM
34
F
1919
168 / 1 / 557
St Nicholas
MCKAY
ELIZABETH SIM
34
F
1919
168 / 1 / 557
St Nicholas
Ignore above, this Elizabeth is accounted for in a 1906 marriage to a Peter Fachie.