I had my hair foiled natural blond and the hairdresser put toner on after the foil. Now the my hair appears very drab/ mousy, there isn't much contrast. Is there any way to get the toner to fade so the highlights stand out more?

I've had quite a few similar questions to yours. Bleached hair will absorb hair color faster and make the color appear dark than your chosen color. You can fade the color slightly by using dandruff shampoos, clarifying shampoos, or liquid dish detergents such as Dawn.