Perhaps you already did sign up?
If you can enter the "Torture Rack" you are already signed in.
I just Re-Did everything...
And yeah I subbed for her no problem. Maybe you dont have enough Credits. As she does ask a Payment for the Subbe agreement, 1.2k Bits to get her on board you might be a little low on Credits. If not maybe you need to load, or you accidentally sold her Card, which she usually reprimands.