Or put the damn ring on a necklace...like everyone else with an ring that doesn't fit any of their fingers but want to hang on to for personal reasons.
The two princesses are very keen on staying around the Bentenmaru as much as possible. Perhaps they will be Misa's replacement, as poor as it would be in terms of public relations for Serenity. That's not just because Gruier sat in her seat during the yacht club adventure, but between the two of them (Gruier's playful enthusiasm and Hilde's thorough diligence) they act as confidant and XO.
Gruier still kind of upstages Hilde, but I think Hilde finally found what she wants to do on her own, not simply tag along after her sister.