If this is Sarah she was alive in 1861,

GR 1861 Census, Bristol, St Paul, Brunswick? Place

Geo. LANE, Head, Mar, 42, Plasterer, b. Ross, Hereford
H LANE, Wife, Mar, 42, Dress maker, Monmouth
Geo LANE, Son 13, Bristol
Wm LANE, Son, 12, Bristol
C H LANE, Daur, 9, Bristol
J H LANE, Son, 7, Bristol
Sarah ROBBINS, Mother-in-law, Widow, 75, Monmouth
A J GRIFFITHS, Visitor, Un, 22, Dress maker, Monmouth

Is this a possibility for her death?

GR England & Wales deaths 1837-2007
First Name Sarah Ann
Last Name Robbins
Gender Female
Year 1865
Birth Year
Birth Month
Birth Day
District Bristol
County Gloucestershire
Country England
Volume 6A
Event Quarter 4
District Number
Page 43
Line Number 36
Entry Number

Have you considered that Selina was a late baptism? There are many examples of this in the records.

Going back a few posts, Edwin BUMFORDS parents were Thomas and Amelia. His baptism is on FamilySearch.