It should be pointed out to her that the tachograph which is infinitely more intelligent than she is AUTOMATICALLY changes mode to other work from driving and decides when to record it as other work and not driving in line with the EU regulations. And point out that when it comes to enforcement it is the information from the tachograph that the law enforcement agencies use, not your delivery schedule.
If she’d hauled me into the office and given me a drubbing down the first words out my mouth would’ve been along the lines of “given you actually failed the course you’re the last person who should be telling me what is and isn’t right” and said very loudly so absolutely everyone could hear it. And when she mentioned about the putting it on break or PoA when you’re not moving I’d have made comments about it being further proof that she clearly failed it miserably because had she not done she’d have known that was a load of crap.