I believe there is a marriage Sep Qtr 1837 of Elizabeth Webber SNOW to Thomas GOFFIN, in Tiverton regn Dist. They had 5 children baptised in Sampford Peverell. One being Robert Snow GOFFIN. Daughter Harriet Jane's baptism doesn't have Snow but her birth regn does in 1854.
Eliz Webber SNOW may also have remarried in Dec Qtr 1873, possibly following death of Thomas.
Hope this helps.