If old shampoo is getting stuck in her hair, I'm not sure that more washing will help.
I would try washing with baking soda mixed with water, letting it rinse for longer than normal and massaging her scalp gently.
Condition just the length, not the scalp, to avoid tangles.
I'm sure others will have more ideas, but this is something to start with...
I do have a lot of trouble with dry scalp/flakes. I'm currently washing with baking soda once a week and with Neutragena T-gel once a week (my scalp loves that stuff). I'm also experimenting with scalp massage, oiling, and Monistat on the scalp. Just started those things, though, so I don't know yet if they are working.
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