My DD, age 14, is fed up with her hair, which is long and light brown and quite fine. It was curly when she was younger and still has some curl in it, especially if she leaves it to dry naturally, or when the weather's humid. Her issue is that she has shorter hairs on top of her head that are visible when they go curly/frizzy. She also wants her hair to be shiny. It's not especially thick hair. She says, even if she brushes her hair during the day at school, by the time she gets home it looks messy again.
What conditioner or other products do people recommend?