Well, I made a mistake. The US arrives at T2 and your wife will leave from T1. If everything goes well at T2, the clear Customs will cost you around 10-15 minutes but the baggage claim will cost 20-30 minutes. Out of T2, you could take the free ferry bus to T1, or take the connected corridor on foot. Both of them will cost 20 to 30 minutes. So, it seems that the time is really urgent. If your wife has few baggages, I think the time will be ok. Another method, why not consider to take the China Southern Airlines, which services a flight to Changchun at 17:50 from T2? Just for your referrence!