Alison Corfield says she is delighted by the parish council's decision to correct her great uncle's memorial name.
Mrs. Corfield, from Shrewsbury, says her family had tried to hide the extra "s" by covering it with mud.
She wrote to councillors arguing that a change would be appropriate as the 100th anniversary of the start of hostilities approached.
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Four men were thrown from one of the cars, and three died at the scene. A taxi driver and his two passengers were also killed.
A chilly and foggy morning with strong outbreaks of wind but it will become milder in the afternoon.
Early frost and fog should soon clear, leading to cloud and rain spreading from the northwest.