I'd ask a professional. You'd hate to ruin it with chemical(s) & the glue would prob be a bad idea. Older fabrics were meant to breathe...they didn't have air conditioning back in the day. I'd love to see it donated to a State Museum, along with the history of your Mother & her friend, plus I'd get your Mom on tape (if she will agree to tape the story) to go with the quilt. Whatever you do, you have a valuable treasure, esp with the date.