My female seems to be sick after giving birth to five pups. I have an appointment with vet but am afraid it may not help. Any advice?

My female seems to be sick after giving birth to five pups. She seemed to stay in labor for two days after the last pup came. She kept panting and acting strange I watched her closely but no other pups came. She now has a dry nose and is low on milk. I fed puppies your formula and her broth and burger. But she doesn't seem to be feeling better I have an appointment with vet but am afraid it may not help. Any advice?