Halp pleeese! Need to know title

Ok so I CANNOT remember the title- But it’s a basic reverse time/ revenge situation, historical vibes. The legitimate daughter is ousted by her uncle & family when her parents die, she’s typically ignored/ abused etc. in her first life. When she goes back in time, she leaves the house and goes to the ml (I want to say a Duke?) with an offer to help him with a curse. She can go into his dreams and find traces of the curse because of her mom’s background. To be by him when he’s sleeping, they pretend she’s his mistress (I think). She stays at his house to avoid her family and eventually ends up being chosen by the queen instead of her cousin to be the keeper of the queen’s finances. She does this by finding/ giving the queen an “unlucky” gem that was actually an heirloom of the queen’s that when in her hands actually turns lucky. Ml is clearly falling for her, but she just wants to study/ successfully invest queen’s money.

Does this ring any bells?? I really want to read more but cannot find it 😭