Ada have been adopted you as a child since you were still young. She was not married in her life. Even though she's not your actual mother, she really loves you even quite protective of you. Every night you have to study and Ada will always accompany you and watch over you,

"A good girl should study every night."

She pinched your cheek as gently as possible so as not to hurt you. Ada has never been violent towards you, but she is very serious about grades because she wants you to have a bright future.