I can appreciate your alarm and being upset but exagerating the situation helps no one.
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She spent most of her time around the kitchen island and was only there an hour. There are now MILLIONS of dents. Every single step she took is visible in the floor.
There are 3,600 seconds in one hour (the time she was in your kitchen) if your friend took two steps every second for the entire hour (which I doubt she did), There would be 7,200 dents from the heels. Hardly MILLIONS!
About those heels. Did you look at them? I'll bet you ten that the small protective rubber bottoms are gone (on at least one of the shoes) and the hard nail the protrudes from the bottom is sticking out. My wife has heels and I'm always taking them to the repair shop to have those tips/caps replaced and repaired. Anyway, those nails are like taking a small hammer to the floor and giving it a good whack. Bottom line, wood floors dent from high heels and it's not the wood's fault. Should the salesperson given you instructions on proper care? Yes. But keep in mind, they are selling you something, not trying to talk you out of it.
About 25 yrs ago, I installed a custom milled, wide plank maple floor. A few months later, the mrs. calls me up to come look at it. I went out and saw thousands of dents in the kitchen. Seems they had an open house party and one of the guests was wearing heels! Wood floors dent, especially from high heels. I'm sorry it happened to you. Maybe make a claim with your insurance company.