Family history notes indicate a Jenny Ironmonger who married a Dawson.
Jenny Ironmonger not shown on any census data between 1871 and 1901. The name Jenny has been added to Mathew Ironmonger's (father) headstone some time after the original text.
Emma E Ironmonger shows up in the Mathew Household in the 1881 census and is not there in the 1891 and 1901 census.
Emma E Dawson married to George T Dawson show up in the 1901 census