Re-dyeing Hair After Coloring With Semi Permanent Dye?

I had my stylist give me an oil slick using five semi-permanent colors. She had to lighten my hair first. It is naturally something between blonde, brown, and red. It turned out great, but also a bit much. My mother and husband hate it. I wasn't a fan of the lightened look before she colored it. What would be the best approach for regaining a more natural look? She had mentioned just using a demi. Should I wash the heck out of it and apply maybe a permanent auburn? What should I watch out for?