Pain and swelling in a 6 year old child? My daughter recently complained about her fingers hurting, she woke up with a swollen thumb and ring finger. I took her to the doctor, he said she probably bruised her wrist and to give her advil, come back if it wasn't better in a few days. So today, 4 days later, she still has some very minor swelling and pain in her fingers, and on top of that her leg now hurts and her knee is badly swollen. No discoloration, doesn't dfeel warm or cool to the touch. The pain isn't bad, she hasn't been crying, just say's that it hurts and is bothering her. I have already scheduled her a doctors appointment for Monday. 
But what could it be? I'm going to be worring all weekend. Any symptoms to look for I may have missed?
Certain questions to ask the doctor?

Summarized question: What is causing pain and swelling in the thumb and ring finger?