First off I made a triangle shaped poof in the front of her head. This is going to be the line you use for the french braids.
Make a thin french braid along the poof line along both sides as show below. Secure the ends with elastics.
I then put the all the hair into a ponytail. To finish it off I wrapped some of her hair around the ponytail.
Below side view
Post Title → Poof, Braids, and into Ponytail