That doesn't sound like something she would say, and I've never encountered her making that claim. I'm pretty sure she got vaccinated and has encouraged other people to do so as well. She does seem skeptical of the ability of the vaccines to prevent infection by newer variants. To some degree, that's probably true right?
It's in the wikipedia article linked by the GP. To help you out -
In September 2021, concerning COVID-19, she tweeted an article by Glenn Greenwald which argued that proof of a negative test is far more meaningful than proof of a vaccine, contradicting experts who argue that testing is insufficient and should be considered temporary to allow more time for vaccine hesitancy issues to be addressed.
Assuming she hasn't deleted her tweet:
https://twitter.com/bariweiss/status/1440687368957095940
She said she was like Galileo here: https://www.ft.com/content/5d840a5c-fa0c-4d08-9574-59f0d3e8c...