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Nitya posted on X a little bit ago so maybe the situation is not as dare, but to be something "tenma can't talk about" and a "personal emergency", it could very well be just a situation where she needed to leave her home for whatever reason. At least it seems like she is safe for now.
I think that it could also be a medical issue, but I do think that if it was just that she would say something. It is probably something more complicated.