To hide her bloodshot eyes and dilated pupils.
I guess that is one possibility.
Seriously, though, I live in a town with a large university. This is not the way academics normally present themselves.
CBF undoubtedly supplied the picture that has been published. It is interesting that she chooses to present herself this way.
To me, it still looks like she still wants attention. Not too many women in their fifties with an established career would choose to project this kind of image.