I need help. My 11-year-old girl cousin thinks she is my babysitter. She's cute and all and my mom says to play along. It was OK at first but then she wanted to give me a bath! No way i đã đưa ý kiến and now i am so grounded. What can i do?

This is not her but it looks a lot like her. My mom says i shouldn't put her face over the internet.
Reason she thinks she's my babysitter is because i used to walk her to school (i get schooled at home) and then walk her trang chủ and i stayed at her house and she was like my tutor cause my mind works thêm like a fourthgeader and she was in fifth grade and thinks she smarter and she is but doesn't make her my babysitter still i played along cause i need moms help and Emmy make me sandwiches and sữa so one ngày when i spilt sữa on me she made me take off my áo sơ mi and pants and đã đưa ý kiến i need a bath no way am i gonna take off my underwear for her and now i grounded.