Three tips for next time.
1. After your friend takes the picture give her a buck and have her sign something that says you have all rights to the picture. You could probably still get her to do this. Say your just trying to keep things legal.
2. If she refuses the buck give her $1000. I'd bet she'd sign for that. Problem is you'd have to sell a lot of copies to make up your investment (payola).
3. If that doesn't work, go to Fry's or some large electronic store. Buy a tripod, $29.00 to $1000+. The $29 would work just fine. Your camera has a 10 second timer. You can walk pretty far in 10 seconds. Some people can run 100 meters in less. Doesn't look like she was standing very far from you. Set the timer, push the button, run, walk or skip to the spot, "sound of camera clicking". Repeat 10 times or so (better chance for a good picture than 3) until you are too tired to do it anymore.