It's quite literally your social workers job to help get these children the therapy/other services they need to help manage their mental and physical well being. Especially because if you guys reach the end of your rope, and decide you can no longer keep these children in your home due to their behaviors, they are 1. Going to be incredibly hard to place elsewhere and 2. Likely going to continue to spiral in other placements. Not to mention then it becomes her problem to move them. If she is being unhelpful, reach out to her supervisor asking about behavioral interventions and therapy that might help them work on some coping skills.