She was trying to move the glass portion of the mirror manually with her hand (that up, down, left, right you spoke of) and gave it a good push to make it move. That caused the glass to break as the adjustment arm or whatever didn't budge.. Neither side mirror adjusts even a millimeter hence the question. Someone mentioned it may be rusted, and that is something I hadn't thought of. The mirror housing is fine, it's just the glass portion that broke.