I'm thinking of either a Swan Maiden or a Siofra.

Swan Maidens are Seelie Fae women that can transform into Swans by wrapping themselves in their special feathered cloaks. I'm not sure which court a Swan Maiden would belong to, either Summer or Spring I imagine.

On the other hand the Siofra are a group of Seelie Wights from Cecilia Dart-Thornton's Crowthistle Chronicles. They are like small elfish creatures who might be found cavorting in the woods or bathing in a small pool or perhaps enjoying a nice feast. Once again I imagine such creatures would gravitate to either Summer or Spring. The Siofra have their own Queen (that would be my character) who may or may not also be Queen of the court to which they belong.

Thoughts from the GM?

Edit: Or maybe Kuma Lisa, though I'm not sure if that figure would fit into whatever lore is already established.