Could just be a hopelessly asocial (not anti-social, just lacking sociability without hostility) INTJ like myself. Some people think I'm always angry or depressed, or scared- and I have the same dead expression on my face:
[media=https://youtu.be/-s2eozXwH3g]
Most common assumption is angry. I can be thinking of Teletubbies on the inside, and people think I'm plotting their death. You can't go off facial with us.
The looking away can be discomfort, having learned they intimidate people, or worst, looking at people can drag you into social situations you are unable to take at the moment. I have actually crossed the street to avoid women at night dressed flamboyantly, knowing they will of seen my face and calculated threat before I even noticed them, and just don't want to deal with the akward passing, so I'll oftentimes just cross the street and continue on.
You can figure out if she is this way by asking her for logical analysis or presenting strategic problems to her, asking for advice. She should offer up the solution usually for free without much effort. If that's the case, just get used to small interpersonal encounters of short duration, and never go off her face or lack of manners. She may be the one person who will truely bend over backwards to help you in a bad situation.
