Is it all over grey or just her legs and feet? Phoebe got like this from taking a walk the other day. It didnt seem like it was gone during her bath, but when she was dried it seemed ok. I'd be careful on the blue shampoos for now, that could make it worse. Did you use a conditioner? Sometimes conditioners will have a stripping effect. You can try to put one on and let it sit for a little before rinsing. The heavier the better. You dont want one thats specifically meant to seal the cuticle, you want one thats more like a deep conditioner. Just a thought. Good luck.