I think she can't keep it, let's say exempted the hatred to the duchess, is that she can't take care of that child since she was tasked and fully occupied to take care of 3 children.
Wait wait, who knows? We didn't see the exact action on killing the baby. What if there's a twist that the child had lived. (own theory: reference--- plots usually existed to other mangas/manhwas.
That’s true, the best bet if she didn’t go through with the murder though is that she handed the baby off to someone else saying it was an abandoned newborn she found in the woods. Though the chances aren’t likely, they’re still there since we saw no body ¯_(ツ)_/¯
I mean she didn’t have to kill the baby though ☹ She could’ve switched them and then leave the duchesses real baby at an orphanage or smt or idk maybe take care of it as her own, not take its life over you and the duchesses beef. Baby came into the world completely innocent of your drama, dude was just trying to live