I would be interested in someone offering a moment by moment legal analysis of what’s happening.
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I can only guess.
There are certain questions an officer can ask at a traffic stop, such as where you are coming from, and where are you going.
That part of the stop seemed to go fine. I also believe she was right to an extent, by saying she only has to identify herself, show her registration and insurance. However, one of the things an officer can consider is whether the driver is impaired. When he asked about her about being irritated, that’s probably what he was trying to determine. If he thought she could be impaired, than I’d say ordering her out of the car was lawful.
The problem with your theory is he doesn’t give the slightest indication that’s what he was thinking after the fact.