The Sixth Amendment to the US Constitution provides
"In all criminal prosecutions, the accused shall enjoy the right to ... be confronted with the witnesses against him ..."
Since the woman wasn't at the traffic stop, she cannot be a witness against the driver. She can't be cross-examined because she has no firsthand knowledge of the incident.
If she's trying to represent the officer, is she an attorney? Is the unlicensed practice of law a crime in that state? (Probably--lawyers have a strong lobby.) She still can't testify.
Your questioning of her might proceed like this:
You: Does the United States Constitution apply in this state?
You: Are you familiar with the Sixth Amendment to the Constitution? ....
A New York police officer was in his car writing a ticket when an allegedly drunk driver rammed him from behind. Unfazed, the officer finished issuing the traffic ticket before going to the hospital. The driver who struck his car drove off, to be apprehended by other police.
St. Clair County, Illinois is having a clean up day. Anyone with a minor traffic warrant can come in to try and settle up. They promise there'll be no arrests.
Image courtesy of Graeme Weatherston