Should we carry on with assesment?

Me and my husband were doing a connected persons assesment as our granddaughter is in foster care she is five months old . Our daughter was on heroin and the baby was born withdrawing. Our daughter is going down more on the methadone and should be off completely soon. The problem is we have had problems with the social worker lying on the report and also they say our house isn’t right for the baby to live with us even if our daughter was able to live here too. As she is still drug free and keeps on the same there will be an application for a mother and baby unit at the next court hearing January 31st if we pull out of the assesment would it affect our daughters chances?