Mary Annora Schofield, 1875, appears to have had 3 illegitimate children, according to some trees on Ancestry, before marrying Mr Tompkins. clovis was perhaps only aware of one, her grandmother. She is a nurse in certain censuses etc
Also, clovis might have found all this out since 2010, and worked out that she had been given the wrong information about her becoming a matron in Windsor.