I don't see the relevance of the Lewinsky scandal to this. No one disappeared in the Lewinsky scandal, right?
Is there any suggestion that she was detained in a secret location? Or is it just that she was effectively removed from all the media and public functions?
It's not clear to me.
But did she actually disappear? This means taken from her home with no-one including her family knowing where she was.
Here [1] the report is that she "vanished from public view". Here [2] that she "she did not communicate on social media" and that noone at WTA "had been able to reach her directly". And here [3] there is no mention of that at all, just people outside of China wondering about her because her presence online was censored.
Based on this I personally do not know whether she actually 'disappeared' at any time, and my guess is that no-one in Western organisations and media know, either. The only thing mentioned in these articles is that people outside of China could not reach her, which is quite different, and led to various speculations.
[1] https://www.theguardian.com/news/audio/2021/nov/25/the-disap...