Your opinion please 💗

I just want to know if I am in the wrong or if my mom is. I am having my first baby in a few days and I’m getting my room set up for her. Her crib is up, swing, and everything else. Now I do live with my mom and my younger sister that is 6 years old. My sister is autistic, so it’s a little harder for her to understand certain things. My sister likes to come in my room, which I didn’t have a problem with prior to me putting everything up for my baby. Just to give a little back ground, just so it doesn’t seem like I just don’t want her in my room. I love when she comes in here but the reason I stopped her from coming in, is because my little sister is VERY destructive. She breaks everything, within a few minutes. She’s broken phone, iPads, tablets, TV’s. My mom brought her, her own big girl bed and she broke it the first night. She also broke my niece’s crib after a week of it being at my older sisters house (older sister was babysitting her at her house). So I’m just trying to avoid my sister destroying my room and breaking my babies things especially before she can begin to use it. As soon as my sister comes into my room she tries to get in and jump in my daughters crib, and tries to break my daughters swing and starts throwing my babies bottles everywhere. She also likes to keep objects in her hand and she bangs on my tv, causing little cracks in it. I love my sister being in my room, but don’t want her to break anything because everything was so expensive and my mom did not purchase a thing. My mom gets mad at me for not letting my sister stay in my room too long, and starts getting attitudes with me and saying mean things to me. Am I wrong for this or is my mom not being understanding ? Or should I allow my sister to come in, knowing possibly things will be destroyed and my mom will most likely not replace anything. And yes my mother knows how destructive she is, she honestly destroys the entire house every day, multiple times a day. And we have to deep clean the house every day or every other day. Can I have your honest opinions please, I’m open to it!