My dear
One day sit with her &talk that my dear sister I respect you rather. I love you tell what you expect from me.
Whatever she tells try to follow.
If this will not work then obey her.
Speak softly.
If she shouts on you, forgive her.
Do not touch her books &, things,
Do not do anything which makes her annoyed
Inshallah this will work.
Pray 5 times & read Quran daily with translation.