I'm sure she is sore. Some birds get very stressed being away from the flock. If she has friend who doesn't pick on her being ill, try putting them together. It can sometimes help. Make sure the other bird isn't going to hurt her. You can try offering egg again, some canned tuna, or even canned cat food. Mixing her regular feed with water to make a mash may help,it will also help with hydration. Nutridrench can sometimes help with appetite, since she's not drinking well I would give it directly. I have hand fed birds on occasion, which may help also. Sometimes if you can get them started, they will go on their own. You can also tube feed her if it comes to that, there is a good thread here on how to do that. Since we don't know for sure if she might have internal injuries I wouldn't recommend aspirin for pain, it may cause bleeding. If she can tolerated it you can use a sling to help hold her upright and make her more comfortable, easier to eat and poop. Some examples below. You do have to supervise so she doesn't hurt herself trying to get out of it. You can also use rolled up bath towels placed around her.