There isn't much help that I can think of. I can't remember right now but some of the signs in the E Concourse have multiple languages. Now if Japanese is one of them is still up in the air. I have noticed little dinky signs getting posted around the airport but they are only in Spanish so that doesn't help her out.
Have her ask around on the plane for folks that are fluent in both. I'm sure someone could help her out. Perhaps one of the stewardesses could help out.
Remember that her immigration forms must be filled out in English.
That might be enough to allow you through security to at least wait in the the International Arivals area out on Concourse E if TSA
is a in a good mood (don't count on it.) Of course that doesn't help her get through Immigration/Customs but they pretty much herd you in that direction so you can't get lost like you could on the train.
Have you checked the main ATL
website to see if they offer such services?
"If you can't delight in the misery of others then you don't deserve to be a college football fan."