Then why did you refer to it as "letter" that was "sent to your address", if it only was a status change on website?
Please do share FOIA request and response again, but blur the name, address and alien numbers so your wife could not be identified.
All of these little subtleties, such as online notification VS letter, how you phrased FOIA request, whether you have proof of certified mail for AR-11 play a big role in your case.