my sister tries to parent my daughter (long vent sorry)

I’m embarrassed to post this as a people pleaser.. and i’ve gotten better than before, but my sister (and honestly a lot of people in my family) talk over me when i’m talking to my daughter, they try to parent her, or just try to answer her questions when she is talking to me. For example she’ll be like “mommy what is this?” or something you know, and other family members take it upon themselves to cut me off and answer her and my daughter has actually said “no, mommy!” before and they just go oh sorry. but it bothers me. Well my specific story about today is that we went to a small party and my daughter had ate 3 pieces of pizza (one of those already being my sister giving her one after i said no!) and i told her no more. Because it’s really heavy and i just don’t want her to eat a lot of pizza but that there are other options 🤷🏻‍♀️ but my sister makes little remarks (always does) and she asked me, “why you shutting down her pizza?” and then a few minutes later in front of the rest of my family she made a little comment and said “well she IS at a party” and i was just like omg. and i said “yeah and her stomach ache later WILL be the same if she keeps going” she ALWAYS does stuff like this. Judges the tiniest little things that I do.. and trust me I have talked to her about it but it doesn’t stop. So then I don’t talk to her for a while and she asks me “why do you hate me” like girl be fr. lol Like is this just something I’m gonna have to learn to live with and ignore? because she’s so comfortable to always be telling me this including in front of family too. And there have been times where she just ignores what I say and does what she wants anyways like gives my daughter things when I say no. Like I feel pretty powerless sometimes and i’m literally the mother????? She so just embarrasses me and tries to act like she’s bigger than I am or something i’m so tired of it 😭😭 she is way older than me btw. she’s old enough to be my mom lol. I’m going to cry because i’ve tried talking with her about it but it never stops. And my daughter she’s little so she obviously chooses to be with my sister over me sometimes as well too because my sister absolutely SPOILS her and you know who’s not gonna love that right! and i feel like that makes my sister happy. because there have been times where she acts shocked that my daughter wants me instead of her like huh????? Like today too! My sister tried sitting next to her and she was like “oh where’s my mommy I want mommy” and my sister was like “awwwww you don’t want me instead??” LIKE HUH???? I need help yall