Responses
But she knows that if she doesn’t marry the villain the story will go on the original path so she may be walking into a lions den but she needs an ally to protect her from the male leads and other nobles due to the rumors and the male leads also may have a higher status than her so she could also be pressured by society to not say no to them because she isn’t as high standing as them.
She already have money
She already have support of her uncle
She got her mana back
She knows that marriage with Duke can be potential red flag on her surviving
Although it's Duke who should be more in marriage he left all problems to deal with his family to her ( he basically doing nothing or barely minimum)