Suggestions for products to style my sister's wavy 2a hair?

My sister loves Dodie Clark, and the way she styles her hair using a curling iron, but curling irons don't work on her hair and she already has a beautiful wave. I'm looking for a relatively inexpensive product to add volume and definition to her hair to see if that is something she would like to continue. Please use the picture below as this is what she is going for. 

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