Is the questioner sinful for remembering her mother's and sister's accusations of hypocrisy and lying against her, and what should she do to forget these accusations without falling into disobedience to her mother?

You bear no sin for feeling pain and sorrow. You must remind yourself of the virtue of forgiveness and pardon, and that whoever forgives will be forgiven by Allah, as stated in His Almighty saying: "And let them pardon and overlook. Would you not like that Allah should forgive you?" And His saying: "And that you pardon is nearer to righteousness." Remind yourself of the virtue of being kind to them, especially your mother. Their harshness might stem from their love for you and their concern for your well-being. And know that repelling evil with good eliminates enmities, as Allah Almighty said: "Repel [evil] with that which is better; then suddenly, he between whom and you was enmity will become as though he was a devoted friend."