Hehe... if you weren't so desperate I'd be LMAO!! Nalia into a Gnoll!! I bet she looks better that way, too!
But let me try to help. What you should always do is keep backup saves so that you can reload the game again. I take it that you haven't done this, so I think you should try to solve this using Shadowkeeper. There is also a chance that the spell will just wear off after some time, so try resting.
Other than that, I wouldn't know. Good luck!
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