Her smile and the lighting struck me as very soft and sweet, and I edited accordingly.
My edit: First I adjusted the contrast. Then I set the photo to black and white with the filter set to green. Next, I layered the photo with a purple, then yellow color with filter set to hard light. I then dodged her eyelashes, lips, hair, etc. The flowers on the bottom of her shirt were distracting, so I cropped them out. To enhance the soft, vintage feel, I added a light vignette. Finally I adjusted the contrast again and sharped.
To see many more fun edits of this photo, make sure to stop by I ♥ Faces