Crown prosecutor Susan Gray said the girl had been re-interviewed by police and there are fresh allegations.
The mother's lawyer, Lorraine Smith, said she had received further disclosure from the police in the morning which raised "matters for the defence to explore".
Mrs Smith said the fresh allegations could result in new charges.
The Crown intends to video the evidence of the daughter and other witnesses under the age of 17. They will be cross-examined via closed circuit television.
Mrs Smith said the defence would be calling its own expert witness but would rather not say who that was.
Judge Roy Wade remanded the pair on bail. A trial has been set down in November.