aww she's beautiful. I'd love to see a picture where you can see her pretty eyes. She may be mixed with a collie or shetland sheepdog because of her ears.
I think it may be Samoyed from what I can see of her tail. The Border COllie/Samoyed would be the desire to please so much....and she is an absolute doll baby! Try doing agility training with her, she looks though she would be good at it!