Your daughter is at the age where they goof around as I call it a lot. Very active. My youngest grandson had to quit football last year. Both of his knees are messed up. They found no injuries but his pain was so bad at night from just being active all day, the Drs. told Susan to pull him out of football. He would stay here and we'd use ice and he has prescription meds. Since getting out of football he is better but they did say not to put him back in it. He is 15. He canot tell us how he hurt his knees if he did. Your daughter just goofing around with her girlfriends or swimming or anything she could have set it off.
As you said, the headaches might have done it too. She may have even gotten a little knock on the head that sat it off in that area. As someone said though it could start without the injury at all.

I hope she finds some relief soon. I would make sure that you do have that right Dr. too. In watching that 3rd Fox news story, it says to keep going to Drs. until you find that right one. I did that when I first started. Of course mine went in a circle right back to my PCP but a good RSD Dr. is very hard to find.

Stay on here and you will learn enough that you can tell the Dr. what you think about the treatments and plans for her. You will learn more then a lot of Doctors know about RSD.

Ada