Try to troubleshoot it around.
Get a fresh export of warden skin, apply full alpha, convert to BLP and test in-game. If it works, then you'll have to re-do channels on your skin. If they don't work, you'll have to either find a way around it or take a new model up.
The "mini" warden, aka the other warden model, the watcher one, might also be suitable for your needs due to a lot of similarity in between them. Just be careful to use the ultimate texturing compilation to reveal where hidden stuff, such as her hair pieces, are located.