There is a public interest test that could be applied (and is, albeit imperfectly, with the "right to be forgotten"). If said nanny said something 20 years ago

There is a public interest test that could be applied (and is, albeit imperfectly, with the "right to be forgotten"). If said nanny said something 20 years ago and has since changed her views completely it is not really relevant - people's opinions change. If she has actually killed children is very very relevant.