Is a girl considered disobedient if she completes her marriage to a righteous man despite her parents' objection due to a lack of social parity and family disputes, and her mother's threat of being angry with her until death?

Your parents are not permitted to ask you to divorce your righteous husband after they have agreed to him, and you are not permitted to obey them in this, as it goes against Allah's command: "There is no obedience to a creature in disobedience to the Creator." You must be patient and rely on Allah, and gently try to convince them that they were the ones who chose him for you, and you are not prepared to seek a divorce without harm. Let your parents know that the Messenger of Allah, peace and blessings be upon him, said: "He is not one of us who incites a woman against her husband." Beware of seeking a divorce without cause, for the Messenger of Allah, peace and blessings be upon him, said: "Any woman who asks her husband for a divorce without cause, the scent of Paradise will be forbidden to her." I advise your husband to treat your parents with kindness and apologize to them, and to calm the situation between the two families.