As far your question goes what I figure out is your wife has been affected with Covid 1 month back and with the profile you are suggesting it was a mild case..In that case your wife needs no more testing and can restart normal activities after 10 days of positive report..You too without any symptom is not under any risk of infection from your wife anymore..
Next Steps
Continue following Covid Protocols..Wear Mask,Sanitise your hands and maintain social distancing.
Health Tips
In case you face any difficulty regarding understanding this feel free to consult me..