https://www.osservatoreromano.va/en/news/2022-12/ing-051/in-...
With some context:
Our initial conversion follows a certain pattern: the evil that we acknowledge and try to uproot from our lives does indeed leave us, but we would be naïve to think that it will long be gone. In short order, it comes back under a new guise. Before, it appeared rough and violent, now it shows up as elegant and refined. We need to realize that and once again to unmask it. Let me put it this way: they are “elegant demons”: they enter smoothly, without our even being conscious of them. Only the daily practice of the examination of conscience can enable us to be aware of them.
[EDIT: the reason I can't reconcile the next bit is because I was confused. Ignore it.]
The next paragraph cites a nun who became a heretic (on a rather abstruse piece of doctrine). That's really a problem in that she was a TV personality, for a group of conservative Catholics who push a culture-war approach that often puts them at odds with the Vatican, especially the comparatively liberal Francis.
And I'm not quite sure how to reconcile that. I'm quite certain that Mother Angelica did examine her conscience quite closely. In many ways Mother Angelica was quite inelegant, and rather outspoken. Perhaps she was listening too closely to an "elegant demon", but I'm not sure if any amount of introspection would have revealed flaws to her.