The Marquis knows how to work a woman. First he tells her, "I only escort my guests to the carriage when the negotiation is satisfactory and that's rare." Then he protects her from society by telling her he'll handle her father, no need for her help.
Then is the gift sending, I guess, but as seen from Daisy's face, that only gave her pause. It was the complimenting her on her negotiation that really made her go doki doki!
Imagine if the grandfather changes his will tho
Marquis: You must work for me for 60 years without pay
Marquis: As my wife!
Daisy: EEEEEeeeek!