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Who cares? She drives a Prius! She doubted you could do something, if you can prove her wrong, she shouldn't be rewarded. It is a bet! You even said she would sacrifice her car if you could...

Sacrifice: a loss entailed by giving up or selling something at less than its value; "he had to sell his car at a considerable sacrifice"

If someone doesn't take a loss, there is no point except to add to your portfolio, buy you a camera, and your friend a new car.