I agree with mornigstar, if your aunt is a talker and wouldn't mind, maybe you could record her words and leave her memories of the quilt with it on a CD, flash stick or SD card, as well as typed out because who knows if any of that sort of media will be usable 50 years from now. Whatever your mother remembers about it should also be included.
Steady Stichin, I love your story, and hope you write it down for posterity! Copy/paste and print what you wrote here - done!