police harrassment to victims of abuse

Dear Sir, I would like to know regarding a particular case of a relative. The victim a girl, who faced abuse at the tender age of around 11 had her parents file the case. The accussed was not caught by the police. The police have come up after 20 years saying they have to answer the judge as to where the accussed is, and the girl should be sent to the police station for interrogation, as they believe it is a love affair and not an abuse. They have even forced the girls parents to write a letter stating that the case is withdrawn. In such a case, is there anything we can advice her parents and protect her and her family from the legal torture...............which is a sad picture of the legal system we have, Thank you, Anita