She's trying really hard not to cry. The constant blinking keeps tears from welling up, holding her head slightly down allows the mucus to build up in her sinus cavities.
The widening of her eyes and raising her head when looked at is to hide her facial expressions, like she suddenly becomes aware that she's crying, lifting her head up quickly to allow her to swallow and drain off mucus from her sinuses.
I wouldn't mind seeing a longer clip if such a thing exists of this particular line of questioning where she's on camera.