At times, even if you know that you are a reincarnated being and you know well enough that you are going through a shitty time, it's best to act pitiful and take the abuse in order to get them away faster rather than standing up for yourself. Especially when you are at a vulnerable age like the fl. Plus, she hasn't even mentioned, at least to my knowledge, who she (the character she was reincarnated into) was in the novel. For all we know, she was just an extra who doesn't get mentioned at all, she just has the knowledge of the novel and already changed a considerable amount out of it.
At times, even if you know that you are a reincarnated being and you know well enough that you are going through a shitty time, it's best to act pitiful and take the abuse in order to get them away faster rather than standing up for yourself. Especially when you are at a vulnerable age like the fl. Plus, she hasn't even mentioned, at least to my knowledge, who she (the character she was reincarnated into) was in the novel. For all we know, she was just an extra who doesn't get mentioned at all, she just has the knowledge of the novel and already changed a considerable amount out of it.