my daughter has very very similar hair (color as well). when i started using product in her hair, it actually brought out the curl.
right now we use either california baby calming conditioner (as a leave in) combined with curl keeper or kinky curly knot today (as a leave in) w/ kinky curly curling custard for styling. both leave her hair shiny,soft, and less frizzy. i have pics of her hair in both my fotki and my blog.