Answer 1: Sí, mi madre me prepara una merienda.
Yes, my mother prepares a snack for me.
Answer 2: Sí, mi madre prepara mi merienda.
Yes, my mother prepares my snack
Step-by-step explanation:
"Tu madre prepara una merienda para ti", then you can write "mi merienda" or "me prepara una merienda", using the indirect object pronoun "me" which means "for me"