Last I checked, the colors pink and green weren't copyrighted (ask the DZs and AKAs) and neither is the turtle.

If she bought it off eBay with some kind of intent to join DZ in the future, then that's her issue and really none of your business.

But since the bracelet didn't have the Delta Zeta letters on it, I don't see why there should be any concern.

I like pink and green and turtles, as do many other people.