I have no sylvan leggos, but have all the epics except the void (dups of most of them actually). How do you think she would do in fw with the epics, potentially? That's really the only place I'm considering her.
in theory with duedan she'd provide enough sustain along with his shield + taunt to make life easy.
i'm not sure if that's enough of a reason for you to do it since I presume you can just overgear your way through FW.