She's convinced herself her own lewd material is a different thing because she's doing it ironically for the content, not piecing together that whenever she does it, people who unironically want to fuck her will cling to it and keep bringing it up.
I personally think worrying about the optics of an overall community is a pointless endeavour, you can nurture the most respectful and civilised group going, but the second one guy tangentially associated with you does something stupid that will be your identity; think how people on the homeland see us. What you can do is just cut out your little corner and keep order the best you can there.
There's obviously a demand for NSFW content and even the more tasteful vtubers have fanservice moments here and there, meaning taking a prudish stance against it is a losing game. The priority should be setting firm boundaries. There is a difference between a streamer showing cleavage on their model vs. someone in chat talking about titfucking them, and it's important no-one in the community feels comfortable crossing that boundary. I fall into the lolbert opinion of "do whatever if I don't have to see it" a lot of people dislike because I really don't care for internet moral crusades about anything, but this is more a wider issue of basic human respect. Assuming women you barely know will be okay with sexual advances from strangers in their chat is creep behaviour.