
Ok,so the story is a historical reincarnation story,it's most likely a manhua, and the mc was known throughout the continent as a poison expert but they killed her in her previous life. In her new life,she is a young miss that was drown by her servant. And her servant took over her identity and faked being her. The mc goes along with this and pretends to have brain issues, and the ml is a guy who has to take medicine.
There's a scene I remember where the girl jumped over the courtyard wall and saw an attendee making a medicine.
Another scene is where the fake young miss took a hit for mc to make her self look good.
I hope this helps(⌒▽⌒)

Not sure if it's this, sorry if it's not ;;
http://www.mangago.zone/read-manga/queen_of_posion_the_legend_of_a_super_agent_doctor_and_princess/
Otherwise maybe you'll have more luck searching through this tag
http://www.mangago.zone/tag/poison/
I absolutely ADORE the Mc. All her reasonings make sense if anything she protected her child unknowingly. For those that don’t like her, remember she has Postpartum depression which is a severe condition after pregnancy that can last a long time and is very dangerous for the kid with just the mother as the sole caregiver. Sometimes it leads to the mother killing the child if I’m right in rare cases.
However she is a child having a CHILD she lost the support group of her peers and was literally suffering alone. What she did wasn’t right but it makes sense. As soon as she got married she was JUST a mother. A lot of mothers i know gone through this stage where they can’t recognize themselves.
I really love this in-depth story of the harm of untreated postpartum, the good/bad parts of being an mother,and unhealthy relationships.
Most commenters don’t like the MC, but what do y’all think?