A Olusanjo OmoniyiImmigration Attorney
This scenario is somehow conflated in that you said she has "a pending I-485 with an I-551 from a pending I-829," which is rather unusual. The filing of I-829 shows she is applying for permanent resident status moving from a conditional status. If she has filed I-829 she would have had her conditional status extended by at least a year and she would have been able to travel in and out of the country without filing I-131. Thus, I-485 should not be in the picture at this moment. Advisably, consider consulting an attorney to sort out the facts and planning of your wife's trip.