Do we know that they haven't been told anything about the Tufts medical plan?
Maybe they have been told about the plan and they don't like it as it is now. Say, if the current Tufts medical plan involves family therapy, they'd kinda have to be told about it in order to participate.
That's what they say. They are not allowed to know anything about the treatment she is getting at Tufts because they don't have custody.