Derringer was just a stage name.
In 2010, in Vancouver, the sportswoman managed to win at the Winter Olympics.
At first glance, you might think so about this promotional film for the song, too.
The common view is that it is Liz Brewer, and that is what I've gone with above.
Anyway, to promote that album and the remake of the McCoy's hit, they made this promo video in the song's original '60s style.
Liz ran away from home at around age 20 and tried some ventures in Portugal.