A prudent way is to advise her to write a small note to her boss, telling him politely that she is uncomfortable with the body language of him, and may be she is wrong. In that way, she would definitely get an assurance from her boss, without loosing out and resorting to the complaint. It is always good to politely and directly putting across what you think your fears and concerns are, and Arabs once get to know this, would not repeat it second time.