I’m so sorry for your loss. At a time like this, an airline shouldn’t be charging you extra for your ticket, and if it does, it should promptly refund your fees if you can show that you’ve had a death in the family. Kudos to Delta for the way it handled your sister’s bereavement fare. That’s the way it should be done.
US Airways, which recently has merged with American Airlines, did not handle this by the book.
If US Airways only accepted reservations through Internet Explorer, how much business would it be turning down? Similarly, limiting your upload to 1.1MB, when a lot of scans can routinely exceed that, is certain to turn away some grieving passengers.
You could have appealed your case to one of the airline’s executives. I list their names and email addresses on my site: http://elliott.org/contacts/us-airways. Remember, though, that US Airways is under no obligation to refund anything. An airline may waive its own rules when you have a death in the family, but it doesn’t have to.
I contacted US Airways on your behalf and emailed the paperwork. The airline has processed a refund.