Will a person be held accountable for feelings of distress towards a specific individual, especially if these feelings are beyond their control and relate to discomfort with the mother-in-law's prolonged presence in their home, and the resulting feeling of lack of freedom to act?

You are not to be blamed for your inner dislike so long as it has not led to any speech or action. Thoughts and self-talk are forgiven by scholarly consensus as long as they do not become settled, based on the saying of the Prophet, peace and blessings be upon him: "Indeed, Allah has forgiven my Ummah for what they talk to themselves about, as long as they do not speak of it or act upon it."

The mother-in-law staying for a long period might cause discomfort, but enduring it will earn the husband's affection. To avoid distress, occupy yourself with what benefits you, in addition to the remembrance of Allah Almighty, for it brings tranquility to the heart. Allah Almighty says: "Those who have believed and whose hearts are assured by the remembrance of Allah. Unquestionably, by the remembrance of Allah hearts are assured."