According to MapBlast it's less than 5 hours of Interstate highway driving to get back to Caledonia from Indianapolis.
So unless his departure was delayed until very late at night, there's no reason she couldn't have gotten back. If it was scheduled as a late departure she should have made arrangements to not work on that Monday.
But if the flight departed much later than scheduled, she should (and may have) called in to work and they should have accommodated her. If the latter is scenario is what happened, and I wouldn't be too surprised, then the company is a bunch of scumbags. Not atypical of those in that sort of business.
That's all explained in the non-excerpted part of the story. This is really a case of he said/she said, and we don't really know all the details. Nevertheless, see my post 14.