Iphone 5 can't receive text from from one number

This will sound crazy. My wife and I have the same phone account and work 6 blocks from each other. We can text and receive text anywhere we are except when we are at work. I can text her and she gets my text however none of her responses make it back to my phone. We have been side by side at her office and she can text me and it never appears. I can text her and it shows up. We can text anyone else. We are at a loss.