I see your problem here, that username "YourNightmareRising" is about 19 characters long. The FH username system is ONLY able to actually take in 16 character name. Therefor your friends username is way to long and it may not let her in game. I'm sorry to say but I think you might need to re-registrar your friend again when the registration box is open.
You can try to send a PM to one of the admins to see what they say, but chances are that you are just gonna have to create a new account with a shorter name (Under 16 Characters)