If that is correct, there is the possibility this is Jane, in Nayland in 1851:
Robert Mann 27 Stoke By Nayland, Suffolk
Jane Mann 31 Polstead, Suffolk
Jane Amburgh Mann 2 Nayland, Suffolk
Arthur R Mann 0 Nayland, Suffolk
Sarah Stow Mother-In-Law 68 Glemsford, Suffolk
HO107/1788 / 328 page 14
Modified to add:
Jane STOW married Robert MANN registered Oct 1847 Sudbury (12/973)