Maybe she wanted to spend time looking at your beautiful eyes for a bit longer.

We had a sort of similar issue at ARN when my Indian-American relatives (on US passports) were going to India with a week stopover in BKK to see relatives resident in Thailand, but language certainly wasn't a good excuse there. Check-in agent was looking for Thai visas in their ordinary US passports and making a stink about no Thai visas and then started on about the lack of Schengen entry and exit stamps or any visas for the Schengen zone when I indicated no visa was required for US citizens on such travel. The airline rep insisted that Indians like them are required to have visas. I said they are US citizens on a US passport and no Thai visa is required of them for such itinerary. The airline rep via a supervisor IIRC managed to get some SNCP or other government authority involved which managed to get someone over to look into it. The passengers had been flagged down by government passport control types even before they had seen the passport, courtesy of an ignorant check-in agent with some kind of ax to grind who flagged them down before the national authorities had even opened the passport. They had plenty of time too, and the business class lounges at ARN aren't really worth much of anything anyway either.

My European-American relatives on US passports out of ARN on the same exact routing were never questioned like this -- before and since then -- by her or anyone else there.

Nosy, ignorant busy-bodies operating on prejudices do tend to produce uncommon results at airports.

I have a story about CPH from last month too, but I'm not going to go into it just yet.