Cannot progress in story. The Black wolf's Ultimatum

[Eisengrim]

I forget which city it was that does it, but look to the sides for an exit like it is going out to the balconies. Was an access point to the Enterprise during a mission at some point. May have been an NPC there you have to talk to first. Forget the details. But it may provide a way to get over to her.

You're thinking of Gridania, I believe.

As for your problem, I can't recall any way to get in there. Have you tried contacting an in game GM though? I imagine they'd be able to teleport you through if there is no other way.