J.B.
I think it would be fine, and a wonderful tribute to her! I never met my late MIL but before my wedding, my FIL gave me a strand pearls that were hers and I wear them both for dressy and casual occasions. I don't think that they'll be prone to damage worn on the ears but you might want to be careful with shampoo and hair products just in case. Maybe a jeweler can let you know how careful you need to be (like should you take them out before shampooing) but I would guess that they'd be just fine.