You could also ask the airline to transfer her ticket to another airline that has a flight that arrives at the time you need her to arrive. Worst that happens is they say no, but it's worth a try.

But understand this: Airlines change schedules ALL THE TIME. Other than Southwest, it seems. Some (rhymes with Melta) change 90% of flights if you book more than a few months out. Others change much less often. But always expect your schedule to change.