In my experience, talk therapy alone does not work for trauma. People often wonder why things aren't getting better after going to therapy for years.
Therapy for Children
Therapy for children is different than it is for adults. In my experience, while most children are able to talk and understand what is being said, talk therapy does not work.
Some people just need to have a safe space to talk and feel heard. In my experience most benefit from including other modalities as well.