I have a theory, and I know it's probably not what the creator intended, but I thought it was worth mentioning. Expect some rambling.
What if Madotsuki is not a Japanese girl? What if she is, for instance, an American? If she couldn't speak Japanese it would explain her inability to dream up more than sounds and numbers.
And, on top of that, it would make the trauma theories involving other characters that much more heavy. Imagine if the only people you were comfortable talking to, let alone even ABLE to talk to, were suddenly gone from your life? For instance, if Monoko got in an accident, if Monoe simply moved too far away to maintain a relationship, if Seccom overdosed ("crashed"), if Poniko was drowned, etc. Although any theories, not just these, involving these characters are equally likely in this scenario. Also, I think Poniko is also a definite non-Japanese character. Ironically, Madotsuki and Poniko are the only characters who have a "normal" room. Poniko is not black and white, which could mean she is a fresher memory, or perhaps Madotsuki connected with her the most, being both foreigners.
Either way, these characters cannot speak to her anymore and that is traumatic. For whatever reason, Madotsuki is unwilling to find new people that she can communicate with.
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