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Vol. 3 covers a full year (spanning one Turtle birthday to the next), so Shadow only ages, well, one year.
And yeah, then in Vol. 4, she's suddenly a teenager, but Vol. 4 sort occurs many years after Vol. 3 (if you were to include them in canon).
Tales Vol. 2 has several stories that cover what could be called a "Mirage Vol. 3" and shows Shadow at several different ages, though there's still a wide gap of "lost time" between her being an elementary schooler and her being a teenager.
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