Her surname was Jones, probably taken from Robert. Having a German surname in N Wales during the war might not have been for the best so this way well have been the reason. She lived in Pen y Ball, Holywell in 1916. She must not have been informed of the death because some years later she wrote to his mother asking after him and was told at that point that he had died. My mother has a picture of her somewhere which he must have left behind. She had striking dark hair apparently. Are we talking about the same Erna? I have no information about the family I'm afraid. School records? I'm no expert on this,very sorry.