Upvote:4
Some airports will give you a “gate pass” which allows you to accompany a passenger to the departure gate (or from the gate for returning passengers). It’s mostly used for children or elderly passengers.
You can ask at the ticket counter if you can have one. Especially since your wife is passing through a sterile transit or emigration area, it’s unlikely in your case that you’ll get one. But you can still ask - and might want to ask on the phone ahead of time.
Otherwise, using a smartphone with video chat (FaceTime, Skype video, line, etc) can be a good way to guide her. Note she’ll have to turn off her video phone while in security.