https://www.tiktok.com/@aocinthehouse/video/7214318917135830...
The summary is: this would be a pretty unprecedented move to effectively ban a social media company. In this case, TikTok isn't even doing anything illegal as far as we know, because the United States has basically no data privacy laws that would be relevant here in the first place. The solution to that problem isn't to ban TikTok, it's to create a regulatory framework where companies are obligated to follow certain rules.
Also, with these sorts of issues Congress usually receives a classified briefing where they're told the nature of the allegations against a specific party. Congress, however, has not been briefed on what TikTok is doing, which is odd. And besides, those allegations should probably be shared publicly in this case because the effects of any potential legislation are so significant. As she says, "this doesn't feel right." It seems like Congress isn't following its normal procedures.
She doesn't talk about the language of any particular bill or how it doesn't mention TikTok at all; I'm not sure if the version referred to by the original video was available to AOC when she made her video.