Lady Margery's Intrigue. Regency Royal 4

At age twenty-three, the petite Lady Margery has already graced the rows of wallflowers for many a season. With the one exception of Charles, the Marquess of Edgecombe, the only man who ever dances with her, Lady Margery will have nothing to do with men; what's more, she does not even particularly like Charles. Bored beyond words, she firmly decides this to be the end of it all and returns to the comfort of her only love, her home at Chelmswood.
But she does not find comfort, not even there. It seems her middle-aged father has taken for himself a dim-witted brat of nineteen to be his bride. Forced into bankruptcy by his child-bride's lust for luxury, Margery's father determines to sell Chelmswood. But Margery will not hear of it and launches an all-out, military-like campaign to ensnare herself a wealthy husband and save her ancestral family home.
Everything seems to be going according to plan until the unforeseen intervention of Charles sabotages Margery's plan, giving them both a run for their money.