Flea dirt turns red when wet, that is what you are probably seeing. However if she has that much flea dirt on her you need to start using a safe flea treatment on her like frontline plus or revolution, something like that.
Forget the store bought sprays and shampoos and junk. Use a safe proven spot on treatment such as name brand Frontline Plus or Revolution. If you don't have cats in the house you can use K9 Advantix, but don't use Advantix around cats.
Declawing: please read this first
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