It struck me that in some way she was nervous of Poirot's eyes. 
She was nervous about Poirot trying to look at her.
She was not nervous at all, and stared at Poirot defiantly.
The former term is used only by economists, the second used only in postal rate circles.
An animal is swimming in the water.
A female Asian is riding a roller coaster.
Unthinkable!
We kidnapped your cousin.
A group of people stand behind a barricade and glance toward the right.