Do we say "in calm", "on calm", or just "calm"? For example:
I am writing in calm
I am writing on calm
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There's no obvious grammatical or syntactic reason why we don't say "I'm writing this in calm".
As @CarSmack points out, "She lived in calm all the days of her life" is perhaps more acceptable. But idiomatically, "She lived in tranquility all the days of her life", for example, is far more likely.
To describe your overall state, use adjectival "I am calm as/while I write". To associate the state more closely with the action of the verb, use adverbial "I am calmly writing" (or "I am writing calmly").