Well, we already know that her thoughts are undecided. So she is probably not sleeping very well, and tossing and turning, through the night. So most likely one of the best words to put into that place would be, anxious, or you could use the word, piercing. I would choose out of these too, depending on the context that the sentence is in. Hope this helps!!!!!
It starts with you waking up, then you listen to what's around, then you realize it's peaceful, then you get interrupted by others. This is the option that makes most sense.