I don't remember if it was reincarnation or transmigration but the female lead was a high status woman who woke up "different" after being jilted by her fiance for his True Love, the peasant girl who rescued him after he was injured in battle. At several points he came to the FL to make trouble about her plotting against the girl/wanting him back but she thought he was trash and was basically just enjoying watching True Love fail miserably all on its own (girl offended her MIL, embarrassed her husband with her manners, etc). It was not the main plot of the novel by any means but I loved the FL.
Yeah, it seems to be one of the many arc in it. In the arc the protagonist was a princess. The male lead was a rising general, but ended up losing his rank after he bothered the protagonis multiple times. The FL was a sunny and free woman with darker skin, but ended up restricted by the custom in ML's house. It's one of the story where I pity the FL.
I remember there was an arc like that in Quick Transmigration Cannon Fodder’s Record of Counterattacks