Gyada has changed from when she first arrived in the Isles.  She has managed to recover her strength and abilities.  It's obvious she's Fey when small or when she hasn't hidden her wings but in her Elf form, it isn't quite as easy to tell.

Including her original description (will edit it later):

At first glance you believe you see an elf.  Likely a Valley elf as she's quite tall and thin.

Looking closer though, some things just don't add up for a typical elf.  Her pointed ears are shaped just a bit different.  Thinner.  She's close to 6' tall, which is tall even for a Valley elf.  Her body seems too thin, too frail.  Yet it is her eyes that really mark her as different.  Her irises are blue, but they aren't defined.  They seem hazy, fuzzy, maybe smokey...  not quite solid.  She has odd lumps on her shoulders too.  

If seen bare, the horror of those lumps become evident.  Her beautiful glossimer wings were torn off.  Her body has been battered too, bruises cover her..  This girl is no elf.

She's fey, and has been terribly abused.