Have you had her x-rayed to know how many pups to expect? The drop of body temp is an indication she is going to go into labor. I would get her to her birthing area (hopefully a well build welping box) and keep her there. It's easier to do in now then after she has given birth. As a first time mom (I'm guessing) she's just scared and doesn't understand whats happening. Keep a close eye on her.