It's a major POE, so yes they do have staff on hand to deal with immigration matters. I've had friends who have renewed their visas there in the past as well with no issues. I assume your wife has advance parole since she is on AOS and traveling outside the US.
Yes, she does. We have travelled to India on our respective statuses without any issues, but just wanted to get an idea of this particular crossing.
Thanks for your help.