Before you can sue her, it's expected that you'd take reasonable steps to become whole again.
That will include reaching out to her directly, to onlyfans directly, and then filing a chargeback with your bank. That'll get you your money back 100% of the time, so, there's really no basis for a lawsuit in civil court. It'll also get you banned off onlyfans if you end up having to file a chargeback, so, keep that in mind as well.
That said, if enough people file complaints here:
the FTC will investigate her (which is very unpleasant) and issue fines if they find anything actionable (which they almost always do).
By "enough people" we're talking 100's of reports here, so, not something that would be easy to make happen. Also if someone's goal here would be to get her to actually get fucked on camera, that's also not likely to happen, she'd probably just quit.