Start by making a box on the top/side of her head. Divide this into three sections. Split the front section in two, and tie a half knot. (Take two pieces, cross them, then put one of the ends through the middle and pull down.) Keep one of the ends out and add the other to the next section and tie another knot. Repeat for the last section.
Bring the rest of the hair into a ponytail and add the extra ends. Make a bun, and add a bow. This picture doesn't show it very well, but there are three little streamers of hair coming down into the bun.