Vanessa George, 39, who had worked at Little Ted's nursery in Plymouth, pleaded guilty last week to seven charges of child abuse and six charges of taking indecent images of children.
She will be sentenced next month, alongside Angela Allen, 39, and Colin Blanchard, 39.
Police said that despite repeated questioning, Ms George had refused to reveal the identities of the children she had abused. They believed that up to 30 children from the nursery are victims.
Judge John Royce called on Ms George to reveal their names before she is sentenced next month.
Plymouth City Council's local safeguarding children board are carrying out a serious case review, which children's secretary Ed Balls said he expected to be completed as soon as possible.
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