AITA for being embarrassed by my cousin saying she want to do OF in the future?

My cousin is pretty popular on Tik Tok with a following of about 300k people. We are both in high school and she posts regularly talking about Yaoi and gooning. Personally I don't have a problem with that because I like that stuff too, but it embarrasses me when she talks about it out loud. Like I don't want anyone knowing that I like that type of stuff especially when we go to a public school and bullying is pretty common. Other than that people have come up to me asking if she's actually on OF because she got leaked a while back. Even though I try defending her and saying that she just got leaked it doesn't help when she's on the internet talking about turning to an OF model on social media. I love her so much but I try to keep our conversation short and school appropriate because she embarrasses me. I feel like she's starting to notice and I feel terrible, but she never listens to me when I tell her I don't like talking about that stuff in school or public. AITA?

Edit: I feel like I left out a lot of information. She recently just moved to my school so that means that she's with me for most of the day. Like I said tho, when we're by ourselves I have no problem talking about Yaoi. I get what some people are saying by telling me to distance myself from her, but I don't want her to feel alone. I know how it feels to come to a school knowing no one, so I'm trying my best to make her feel comfortable. But like I said she keep's talking about it when other people are around. Also I have no problem with her doing OF in the future but it gets to a certain point by talking about it 24/7 and that all her idols are OF models. And yes her mother knows what's she's posting and what she's gonna be in the future. I've tried to get her to open up to me but she never does, but her whole family be keeping secrets so I don't know.

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