Firebird of Glass by Zoe Chant

Her first Christmas might be the last Christmas

Tadra has known her entire life that she was meant for a great destiny. But she never expected it to happen like this: trapped in a strange new world, her magic broken and her voice silenced, unable to shift to anything other than a tiny shadow of her firebird’s glory.
Ansel’s kiss releases Tadra from her glass prison…just in time to face the battle bearing down on both of them.
The local mall is decked out for Christmas, but no one in line for Santa Claus knows that the changing of the year is when barriers become weak and a great evil is about to escape into the ordinary human world. When their friends are lost, only Tadra and Ansel stand together against the coming forces of darkness.