Paging nyapbp, IRL Fran Becque! She is Pi Beta Phi's historian and she can tell you exactly what Pi Phi's policy is. My daughter is also a Pi Phi, and she rescued a badge with Fran's guidance a couple years ago. I think I might still have the PM where Fran told us the explicit guidelines.
ETA: I PMed Fran. I also found the old PM:
"We, like most groups, have three options for the disposition of badges - be buried with it, give it to another Pi Phi, or send it to HQ. Selling it on ebay isn't one of the options."
My daugher says "thank you" for respecting the badges and she is sorry to hear of your Grandmother's passing. It sounds like your grandmother was a wonderful sister.
