If a Family Court has approved a match between a child in care and prospective adopters, there will have been a lengthy process to consider what is in the best interests of the child.
Prior to care proceedings, local authorities are expected to have conducted assessments, offered any support identified in the assessment process, to help the parent make any changes found to be necessary.
If when the application for an interim care order is considered that hasn't happened (say because its an emergency application following serious incident), the Judge will ensure the assessment process takes place.
The child's parent(s) will be legally represented. The child will be repressed by an experienced solicitor chosen by the court appointed Children's Guardian.
If a child is to be removed from his/her parents before or at the start of care proceedings, the social worker has to ask the birth parents if there are any family members who can care for the child. Grandparents or usually the first people to be considered along with aunts and uncles.
It is rare for an adoption plan that has been approved by a Judge to be appealed. Your daughter will have been given advice by her solicitor throughout the proceedings. It sounds as though you haven't been actively involved?
I've got another 'keen'... Ouch!