There is a death of a Richard Onions in Shrewsbury, Q1 1856 6a 553 (if Hannah was a widow when she married Richard Davies then this may be her first husband).
A Richard Onions married Hannah Purslow in Shresbury Q1 1841 (Hannah would have been 17 according to christening record but younger from subsequent census returns, but it is possible she was subsequently reducing her age when if she married a much younger man, Richard Davies). Q1 1841 v18 p200.