How warm is her bedroom? I ask because I'm a chronic night terror sufferer. It's actually starting to really annoy me in all honesty. But my body temperature plays a massive role in whether or not I suffer from them. It's maybe not the reason your bairn is, but it could be a possibility. The difficulty for you would be getting the room temperature just right. Obviously you need it cool enough for her to stop suffering, but still warm enough so she doesn't get the cold. Maybe worth checking her temperature (or physically feeling if she's sweating) the next time she has one. If she is roasting then it's possibly not as a result of the terror, it's more likely the cause. Hopefully that's what's causing it.