I am so relieved to read this thread. My DS6 has trouble organizing his thoughts as well. He can write and draw, but organizing and communicating ideas just aren't as sophisticated in his writing as they are when speaking to him. He is obsessed with the Titanic and the escapes from Alcatraz. We've provided books, documentaries, movies, whatever supported the interest. I am constantly on Wikipedia answering his questions. We would love for him to do something with that knowledge, but he's resistant to writing. He draws pictures sometimes, but the encyclopedic knowledge stays tucked away and hidden.
Reading about your daughter wanting to write a book about the subject just sparked an idea though that I'm going to try myself. Have you tried taking video of your daughter talking about it? It could be an easy outlet for her and a way for you to facilitate by interviewing her about it. It's just an idea for an easy way to help her get her opinions and knowledge out there without being hindered by motor skills.
