What is the ruling on a daughter emigrating from her country, leaving her mother and father, because her mother attempted to molest her, and because her mother did unbearable things to her father? And is she sinful for her emigration, given that she did not tell anyone the reason?

What you mentioned about your mother's harassment is strange, and she must repent. We advise you to pray for her guidance and righteousness, and to gently offer her advice, reminding her of Allah and His punishment. You should avoid her while striving to maintain connection with her as much as possible. Be careful not to mistreat her, conceal her secret, and do not tell anyone about her situation.