Any home remedies for a bad dye job?

I've been to this stylist for 20+ yrs and I think her mind was on camping while she was doing my hair. She's out of town now til next week. My hair is in good shape finally. But the summer sun has lightened it to almost a blonde~not me! The color I wanted was a med auburn/ with copper gold(cg 7) and she talked me into using a rb7 to tone it down and not be so viberant. Well, the lighting in her salon is not comparable at all to the sun. I have purple colored hair. I am just SICK. All weekend with a cap? I was told to wash it with Dawn dish detergent. I did, (6 times), then I condition at the end. Some color was in with the suds. My ponytail scrunchie has color on it, after my hair was dried. My cap has color in the inside. Why can't the "purple" go away? Are there any home remedies, that will not harm my hair but take the plum crazy color out of it? Thanks for any expert advice.