Home Secretary Theresa May has launched an independent inquiry under an expert panel into the handling of child abuse cases by public bodies.
A panel of experts would consider whether "public bodies and other non-state institutions have taken seriously their duty to protect children from sexual abuse", Ms May said.
Prime Minister David Cameron earlier said his government would "leave no stone unturned" in finding out the truth.
The Baroness says she did not consider the "difficulties" caused by her background and family connections to the child sex abuse inquiry.
Questions have been raised of former High Court judge Baroness Butler-Sloss since her appointment last week.
22 police officers are now assigned to Operation Fernbridge - the probe into claims of a Westminster cover-up of sex child abuse.