Originally Posted by
mikeyf
doesn't UA101 depart at 10:45 pm?
Yes, it does, so there's something amiss in the original message. Either the OP's sister really has a five-hour transfer at IAH, in which case everything will be fine, or she's actually on the 5:45 PM departure out of BWI, which was scheduled to arrive at 7:58 PM, and there was a miscommunication somewhere.
If she's on the earlier flight, she seems to be fine so far. If she's on the later flight, I'd be a bit nervous at this point, because the inbound from IAH is delayed. If the situation gets worse, that's definitely a flight that could be in trouble.