i love the AI and hope to see it improve, im unsure wether she is a roamer or a teleporter (i had her stuck to my back on one run which was very creepy - i could see her face every time i turned the camera around until she eventually just stabbed me), i think a full roaming AI would be nice because it removes random deaths.
Some things i think would be neat would be hearing her footsteps, hearing her voice in the distance and if possible maybe having her look through windows to find you (it would give the crouch mechanic some use).
Best of luck with development.