Ehhh, IMO her hair color is somewhere between Cosplay.com's Natural Red and Dark Orange. It's a lot more coppery-toned than Natural Red, but Dark Orange is not red enough. For a realistic look the choice would be Natural Red, but it doesn't look like a good match to me. (I've got the swatch ring in front of me, too.) Arda's Dark Copper Red looks the closest match to my eyes, at least from the owner photos on their site. (I don't have their swatch ring to compare.) But you should also consider what will look better with your own coloring - something more orange-y or more red? Something a little lighter, or a little darker? Personally I know I would go for the darkest realistic shade because I simply look better with darker hair. Light wigs look too fake on me.
"It's the ladylike way to kidnap."