Ok so I just want to remind you that a lot of people are thinking that nerissa is faith or faith is nerissa and blah blah blah.............
Ok . Here's what I think. When lily died ( when she was glamored as snow ) she re-transformed to her own real body after a while which is a troll.
So here's my point.... when faith died we didn't see her transforming , so nerissa was glamored as faith when she was at the woodsman's apartment.
Faith is actually dead ( that's my opinion )
SO nerissa is glamored as faith and completely not the opposite
I know i am a little late to post this but it just came to my mind
Remember guys this is only a theory