Originally Posted by
jjmpdx
I reached them today about my cancelled flights. They’ll refund me, but it will take 3-5 months to process.
That's an example of an airline being unreasonable, and probably in violation of EU law (not sure if EU travel regs. bind Iceland) which requires a refund within 7 days of request after a cancellation.
The OP's situation, however, is not such an example. It's very unfortunate how your mother was unable to get to her flight, OP, but as others have noted, Icelandair is not at all to blame for that. You can't reasonably expect them to do anything more than whatever her ticket conditions require of them (if anything) when she missed the flight that flew, as scheduled.