Given the uncertainty of the Fathers and therfore that blood line, I'd love to know more about Susan/Susanna and her parents, location etc.
I can't see a baptism for a Susannah West Bow Brickhill
There are a number of Susannah's baptized Bow Brickhill namely
Susannah Smith 8 Jan 1810 parents James & Elizabeth
Susannah Henman 8 Mar 1812 parents James & Charlotte
Susannah Garratt 2 Jul 1815 parents William & Elizabeth
There are these two marriages Smith to West on familysearch
Susan Smith to William West
16 Mar 1833 Wycombe Buckinghamshire
Susannah Smith to Thomas West
26 Dec 1834 St Boloph Bishopsgate London
The only way of confirming her maiden name is to obtain one of her children’s birth certificates and then obtain her 1850 marriage certificate to John Chambers which should give you her father’s name