Against anyone attacking you to do damage, you can use your Seduction as your Dodge. Against attempts to capture or other non-damaging stunts, it has its normal value. If you do not behave helplessly enough, the GM is free to temporarily revoke this schtick.
Ladyfingers is a Helpless gambler, not a brawler. She has a Seduction of 15, and her Martial Arts is 9. Against a bullet, she has a Dodge of 15. But Slim Joe decides to use her as a living shield, holding her at gunpoint; against this stunt, her Dodge is only 9.