I can't remember if its Reincarnation or not, but I believe the premise is she's an illegitimate noble OR the father remarried and the stepsister and stepmother hate her. It's been about a year since I read it, and I believe it didnt have many chapters to begin with.

Some noteworthy scenes I remember

1. FMC and co get visited or visits another prominent noble, and for some reason or another finds out the FMC is wearing old/tattered undergarments
2. One of the maids/servants has a sibling that supposedly the stepsister is supporting. Turns out the sibling is still in the slums and they haven't received any support, causing the maid/servant to align with the FMC

Any help with this is appreciated