While "legally," cops may be cops 24/7 and can carry their badge and gun off-duty, seeing someone "speeding" is not normally something any department would encourage an "off-duty" officer to take action on. Responding to screams of help? Of course. In a restaurant and another patron needs CPR? Yes. Hit and run? Maybe. Speeding? No.
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But he did identify himself and plainclothes officers, detectives, and investigators contact people all the time for various reasons....including investigating crimes and making arrests.
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So she (1) should have known he was a cop (2) didn't know he was off-duty if he was "off-duty."
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Regardless, his department will review his actions....and apparently the court will review hers.