"I went through a phase of guilt for not knowing what happened to her. I blamed myself for thinking that the place was safe.
"But the certainty that we are truly responsible parents has helped me carry on.
"I know that what happened is not due to the fact of us leaving the children asleep. I know it happened under other circumstances."
Asked about whether she and her husband were responsible for their daughter's disappearance, she said: "It cannot be considered a crime. Someone committed one, but not us."
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