Wagering on the Wallflower (Young Victorian Ladies #1)
Eva Shepherd

And an elegant gentleman...
Gauche Hazel Springfeld is reconciled to being left on the shelf. At a society ball, she is improbably asked to dance by charismatic Mr. Lucas Darkwood. When she discovers it was all for a wager--he'll win a prize if he can turn her into marriage material--Hazel plans to get her own back! She'll frighten Lucas into thinking she really does expect that proposal--from him!
From Harlequin Historical: Your romantic escape to the past.
Young Victorian Ladies
Three spirited sisters, all highly individual, find the men who are just right for them
Book 1: Wagering on the Wallflower