I wouldn't recommend it if you are not familiar with DXB. If I understand correctly (assuming you have no checked bags), you'll need to go through T3 connections security (follow signs for connections when you exit your flight). Once through security then follow signs for the C gates (will require a train trip if you arrived in A). Once at the C gates you need to find connections security and go through it the wrong way (so that you are now mixing with Concourse C arriving passengers) and follow signs for T1 arrivals/baggage and locate your wife before or after immigration.

It might be easier to change terminal land-side (shuttle bus, taxi or metro - I don't know if it's feasible to walk).