I watched my neice today & she jumped in the bath with my kids. But I was excited because that meant I got to do another little girl's hair:)
First, I parted her hair on an angle, instead of straight, just to add a little more to a bob. Then I round brushed her hair in 3 different sections: the bottom, middle & top. I used my biggest roundbrush, which I think is the biggest size you can buy. I blow dryed the base as much as I could, to give it more volume. But don't round the sides as much as you would the back. Add a cute little clip to keep her bangs back & there you go!!