Not that I am an expert on this as we are still TT for daytime let alone night time.
Have you ever let her wet the bed? How does she react to that? Maybe if you try to get her to go to the toilet before bed or after her bottle and if she has an accident suggest that she goes with out the bottle the next night to avoid having the yukky wet bed.
Are you giving her cow's milk? We weaned the bottle by diluting the formula eventually DS didn't want it.