Her temp seems to be good as of right now. That can change at any moment. Sometimes after a traumatic experience like this, they go into shock where their temperture drops and her gums are pale. Earlier you described that her gums were pink. Just keep an eye on them. Make sure they do not get too red like a strawberry. When you push on her gum and you see the white finger print, make sure it does not stay white for more than two seconds. This is called capilary refill time. The time it takes for her Red Blood Cells to refill. It would mean that she might be losing blood internally if it stays white a little longer. When you look at her gums, also take note on if they are dry or not. If they become dry, she is becoming dehydrated and try to get her to drink fluids as much as she can.
Keep an eye out for her to urinate and examine it for blood. Her bladder could be bruised. In this case only time will heal a bruise. If she keeps drinking water and doesn't urinate til tomorrow, there is a chance that her bladder has ruptured. Keep an eye out on her bowel movements. Same things applies to her colon as it does to her bladder although her fecal has alot of blood, that could mean a tear as well. In this case, you need to take her to an emergency clinic to be evaluated.
If the impact of the car pushed her really hard, it could have caused something called a diaphramatic hernia. Here is more information on that and what to watch for.
As far as her leg goes, there could be a break in there since she is not bearing any weight on it. I am sure she is painful and very uncomfortable. As for her pain, You can give 1/2 a buffered aspirin. Only give once daily.Usually I don't recommend giving aspirin in this situation because of the fear of internal bleeding. If you do all that I have recommeded at the top, and she seem to appear normal, then you can give the aspirin. I know she hurts and I would hate to be without pain medication if I was in her shoes right now.
If things become worse and her breathing is more shallow and she becomes pale, please take her to your nearest emergency clinic. This could mean that she has internal bleeding or something of that sort.
Tomorrow she should be able to eat and drink more. Right now she needs to rest. She will be more painful tomorrow. Things always hurt worse the day after.
All of my suggestions are things to be aware of and to look for. Without me seeing the dog, I can not make a judgement on her pain level or her quality of life. Use your judgement to know how bad she is and when to take her to an emergency clinic.
Hope this has been helpful and please let me know how she does. I will be praying for the little girl. Keep me posted. Thank you