Brush the hair & part it. Blow dry it until it is ALMOST dry. Don't dry it all the way.
I round brush her hair in 3 sections:bottom, middle & top layers. I start at the bottom & clip the rest up, as shown in the picture. I like to take the blow dryer to it again just before I start round brushing to make it a little more dry.
Start closest to the head & make your way down, with the blow dryer following (obviously couldn't show you the blow dryer because I don't have 3 hands)
Do this all around the bottom layer until it is completely dry.
Let the middle section down & clip the top up. Begin round brushing this layer until it is completely dry.