I'm so sorry to hear about your poor girl.
Unfortunately, it sounds like you are going to have a lot on your hands trying to nurse her back to health. The diet she is on has not provided her with much to help her through such a traumatic injury, even the healthiest of gliders would be a struggle to get through this. The pain medicine will slow her down a bit and help with the pain, but as you've seen it is causing other side effects compounded with this shock to her system.
You will need to keep her hydrated, especially now that she has diarrhea in addition to not taking in food. Keep up with the pedialyte. Also offering some juicy fruits such as melons might tempt her into eating and will provide her with some fluids as well.
The BML staple will have a consistency that you will be able to feed it with a syringe. Remember that their bellies are very tiny, about the size of only the tip of your thumb. Be patient in feeding her this way to keep the stress down and try to do less food and more feedings. You can go ahead and mix the BML staple if it will be awhile before the supplements are delivered. This will at least get you started on getting something into her. Try getting some yogurt into her, which may help with the diarrhea caused by the meds. If it continues many people have had success with a tiny bit of canned pumpkin, but you will have to be cautious not to go the opposite way and have her constipated.
She's going to need steady care to get through this. I wish you the best of luck. I'm sure some others will have some suggestions for you.