I'm looking for a specific manga about a heroine who possesses the illegitimate daughter of the Tang family. I believe she was originally a founder or ancestor of the Ice Palace who passed away leaving the Ice Palace in great condition but after she's reborn she finds out their situation is terrible, having fallen over the generations.

As the Tang family's illegitimate daughter she's abused by everyone including the servants, but her attitude inadvertently wins the favor of her husband to be. Although he's insulted by the Tang family and has no good feelings for them, he recognizes that the heroine is abused and ignored by her family so he feels sympathy for her.

After the heroine goes to the Ice Palace, she does her best to help them improve their situation. First she finds the hidden location where a valuable herb is grown. Apparently everyone wants it for various reasons. She decides to hold an auction for it and I believe she gains the fertile farming territory of the Tang clan?

Later with her husband, she investigates the Ice Palace's accountant and reveals their embezzlement.