I don't know the brand, Jasons, but an excellent treatment is T-Gel by Neutragena. However, it is extremely drying to the hair and scalp and can't make the body produce excessive sebum. There is also a fabulous line for scalp issues by Dr. Hausckra, that is based on homeopathic medicine. Dr. Hauschra also has an essential oil for scalp massage that could help reduce the itchiness. Nioxin also makes a scalp treatment (shampoo and then a scalp conditioning treatment) that does wonders for dry scalp and psoriasis.
Does your daughter have crusty areas that are difficult to remove from her scalp? Does her hair break in these areas? Is the hair texture different at the sites, such as thinner or frizzier? It might even make the hair appear to look gray. She may have psoriasis. Be extremely careful when removing the crusty scabs, as this will leave her scalp ultra-sensitive, and could even bleed a little. Prior to washing her hair, try using a little olive oil or almond oil in the area to soften it up, then remove by massaging or lightly moving a comb flat against the scalp in an easy motion (no digging or scrapping). Test for an allergy with almond oil, because this could make the situation worse. It seems crazy to add oil to oily hair, but if you try to remove scalp crusties without softening, you'll damage the skin and encourage infection.
She may grow out of this once she hits puberty, or it might be chronic. Ask her pediatrician or dermatologist for advice if it doesn't improve with the over-the-counter remedies.