Nearly upright for most of the rainy course before crouching into the tuck position for the final gates, the Thai racer finished in 1 minute, 44.86 seconds - 26.98 seconds behind leader Tina Maze of Slovenia.
She celebrated in the finish area, raising her arms and ski poles over her head.
After all, Vanessa-Mae did better than the 15 racers who did not finish their runs.
"It was really cool," she said. "I expected to be last but you know at the end of the day the Olympics is a great opportunity."
Vanessa-Mae was born in Singapore and raised in Britain, but is at the Olympics as one of two athletes on Thailand's team. She's competing as Vanessa Vanakorn, using the surname of her Thai father.
"I said to myself, 'If I qualify I'm going to set a goal for myself,'" she said. "I made (a) pledge that I'm going to make a big donation to charity, because I support animal charities. So my main purpose for being here was to really have a good time, to improve my skiing in a very short amount of time and to help some animals out there."
In the second run later Tuesday, she'll be the last racer down the slope.