It sounds fine to me if you're trying to say she keeps herself busy 24/7
Maybe rephrase:
She has a habit of constantly working on something.
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Ok
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In my opinion, "She has a habit of regularly working on something" sounds better.
However, I don't know the complete meaning of the sentence, so it's hard to give an objective answer.
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It would make more sense if 'something' was more specific.