My best guess still applies, especially as you've been booking stays she's not stayed at. Have your GF them a call, after all it is her account, and be *nice*. If that doesn't work then put it in writing, they have to reply. Remember since it's your GF's account and not yours, as she hasn't done anything wrong either now or in the past, you should be able to push this to a successful conclusion, though it may take both time and persistence...

Good luck!