There was a fourth child. Bermuda Royal Gazette 3/24/1846 cites she was aged 33, leaving four small children. Clara Hallett, the Bermuda genealogist, has her name listed as "Eliza Mary Mallaby (Higgs)." I assume this to mean she had been married before Daniel Seon to a Mr. Mallaby, perhaps having a child with him and then three more with Daniel to total the four mentioned in the obituary.