I haven't read all the replies to your post yet so perhaps someone already suggested this...
You could take the quilt to a photographer and then have copies made into stationery and send each 'sewing sister' a note on your grandmothers birthday. They can have the card framed and save the memories or toss it, but you will have shared the quilt with them.
I have had cards made using photos and they are inexpensive and delightful.
www.snapfish.com does a great job and so does
www.costco.com There are many websites that do stationery and/or large, frameable prints.
Whatever you decide, I hope you will leave the quilt intact. It is a treasure.