Is a wife's dislike of her husband's sister forbidden (haram) or permissible (halal) due to personal situations?

It is obligatory for a Muslim to love for his brother what he loves for himself and to dislike for him what he dislikes for himself; this is part of the perfection of faith. If the dislike for the husband's sister is a heartfelt dislike that cannot be controlled and does not lead to severing ties or envy, then there is no sin in it. However, this dislike should not be evident in how one interacts with her. Rather, one should respond to ill-treatment with kindness and overlook it, in accordance with the Almighty's saying: (Repel [evil] with that which is better; then, suddenly, the one whom between you and him is enmity will become as though he was a devoted friend. But none is granted it except those who are patient, and none is granted it except one having a great portion [of good]).