Nancy is absolutely right, and I pray it is not too late for this tiny one.
Try to slip a tiny drop of formula into her mouth, on the side under her muzzle, drop by drop. Make sure it is WARM. If you can do this every 15 minutes or so, for several hours, you might save her. She is in severe shock from dehydration. She got the diarrhea because her formula was too diluted, plus she was getting the Pedialyte. Her body has no reserves of nourishment to draw upon.
DROP by Drop. Keep her warm, keep the formula warm, and pray.