Sounds more like an Apple function issue. Verizon sends SMS to your phone number, not the device. I've been having my own troubles with imessage blocking my SMS when initiated by an IPhone. Try going into Settings> Messages and turning off imessage. Have your wife send you a text and see if it gets through. If it does, leave imessage turned off for awhile to see if her messages to your phone stop. If they do stop, her account is still somehow associated with imessage.
If they stop, turn imessage back on, then in the imessage settings, check the Send and Receive to see what addresses are listed. My guess is that her phone number might be there.