I'm so sorry you're going through this - it sounds very difficult. The only thing I can think of is to prepare her for night time throughout the day by reminding her "tonight mommy is going to do story time before bed" (or something like that), so that when the time comes it's not a rude shock to her. I know that if I prepare my dd like that (say if she'll be at a babysitter's for her nap) it works much better than if I don't prepare her.
Good luck!
Good luck!