Does anyone know how to relinquish a child you adopted from the Ukraine?

My best friend adopted twins three years ago from the Ukraine. They are both eleven now and will be twelve in January. One twin is doing well but the other is not. She hurts the animals and bullies other kids at school. She has only bonded with her adoptive father. She is fluent in English and completely healthy. Does anyone know where we can place her for adoption? The family is certain this is the best for all involved. Thanks for any advice in advance.