Nar-Anon is for families/loved ones. NA (Narcotics Anonymous) is for addicts.
But going to an open NA meeting might be very enlightening for her. She might be more comfy if someone else went with her, but open NA meetings, like open AA meetings, are for anyone who wants to see what it's about. She wouldn't be expected to say anything at an NA meeting, and if for some reason they were going around the room, all she would have to do is to say she is just visiting.