Wow. Your child sounds a lot like our daughter. I've been trying to determine if what I see is a typical brain response to having experienced trauma or the impact of trauma on brain development thus causing some sort of issue. She has great handwriting, excellent fine motor skills - better than mine, actually - she learns very quickly, but doesn't seem to be able to answer any questions. If I read a story and ask her very simple questions about the story she is unable to answer any of them. If I try "yes/no" questions it might work. But the more questions I ask, the more it's a threat and she just shuts down. The girl can count to 100, count to 100 by tens, and the other day could not count to five. All on her own she was proudly counting by tens to 100 for Daddy, and I asked her to try it backwards. She got stuck at 50. So we asked "what comes before 5?" Could not answer. So I used puzzle pieces as manipulatives to essentially reteach her. With the manipulatives she could count to five. I removed the puzzle pieces and asked her to count to five and her responses were "100" "50" "10" It was alarming.
I haven't been able to tell if she is playing us. She is still learning English (we adopted her 9 mo ago), which is why I can't really have her assessed yet. But there are times when she just blows me away by information she retains. I'll tell her a story, or teach her something thinking it's a waste of time as she isn't going to understand a word I say. Then weeks later she'll bring it back up.
But, we also have circumstances too like your's when you said your son wrote "didn't want to go to Colorado. Why or why not." I'll ask her something or say something to her and she basically repeats what I said. And it's frustrating to communicate literally like that. I wish I had an example, but I can't think right now.
We've done some kindergarten/pre-school work in the few months after she came home and she seemed to learn at a speed I was happy with. I don't have high expectations, but she's always exceeding them. We are officially starting Kindergarten next week.
Now I don't know if this is something I really need to watch out for, or assume it's a normal progression of ELL/trauma brain.