When you point your flashlight at ellie or any body's face they do a "bright light in my face animation" I did it to ellie and she kinda squinted and she looked away from the light slightly.
Only just noticed? :3
Also that can happen to Joel too, if there is e.g. a lamp (like in the University), Joel also covers his eyes from the light.
Other companions such as Bill do the same as Ellie if pointed with light, also! Yep, this game is awesome.
I have acquired the grade of Master in The Last of Us story/character/game knowledge as I have played it through 9 times.
... I have no life.