What’s a good response to her opener?

nice!!! but the goal is to not break down and say "for you free". I would flirt around with the idea of maybe saying "get me while you can I'm in high demand ;)" or maybe "Sure, if you play your cards right". (used that one earlier it worked for me... who knows). Essentially set up the frame that she has to Woo you, not the other way around. Def would want to know other ideas from the community.