I hope I can explain this hairstyle in a way you can follow.
First pull the front hair forward. This is to place the ribbon around her head. Picture below gives a visual.
Once the ribbon is laying across her head you start tying knots. Because of how thin her hair is I tied the knots across the ribbon and then pulled once side to the opposite knots elastic as shown below.
The picture below shows the knot being pulled to the opposite elastic.
I continued tying them along the front of her head 2 on the very top and 2 on each side.