You don't want to put Permanent color over Permanent Color Down the hair shaft. If she used an Acid Demi type color to refresh the mid lengths to ends while an permanent only on the fresh roots that may be healthier choice. Like Colorance, Shades eq, Viviance, Ion Demi, Prem Creme Demi, Wella Color Touch Semi, Matrix Color Sync, color Shampoo/Conditioner, Clear Gloss Glaze Demi. What is her Hair Level/Color Roots (NATURAL)?Gray percentage?
Just FYI, Wella's Color Touch line is demi permanent.
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