Is my wife's case lost? What can we do?

Is my wife's case lost? What can we do? My case approved 2 months ago at VSC, but my wife's case is still pending, and the case status even doesn't tell where the case is. The following is said about my wife's case:

The I485 APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS was transferred and is now pending standard processing at a USCIS office. You will be notified by mail when a decision is made, or if the office needs something from you.