If she's not super involved I'd pick a charm that reflects her interests instead.
For the grandparents, I'm not sure. Are you just looking for something small? Would you like the kids to spend more time with them? You could do a certificate for an activity?
My go-to for that kind of thing is a photo calendar of the kids. I've also made photo coasters. Otherwise, I'd just do gifts for them. A book, nice blanket, gc to the movies.
For the aunt, I'd do an Alex and ani related to her interests or something else generic.