[QUOTE=Queen Annalise]Visitor… Moon-scented hunter… I am Annalise, Queen of Castle Cainhurst. Ruler of the Vilebloods, and sworn enemy of the church. Yet, our people are murdered, and [B]we are prisoner to this wretched mask[/B]. What is it thou’rt in search of?[/QUOTE]
She does comment on the mask (very briefly), but I'd say that even that one sentence is enough to conclude that someone put the mask on her against her will, and that she's incapable of removing it. As for what it hides, there is actually official (actually official official) [url=https://vignette.wikia.nocookie.net/bloodborne/images/a/a5/Annalise_concept_art_1.jpg/revision/latest?cb=20180803102807]concept art[/url] for the game that portrays her [url=https://vignette.wikia.nocookie.net/bloodborne/images/1/1f/Annalise_concept_art_2.jpg/revision/latest?cb=20180803102834]without her mask[/url], as well as a couple of in-game [url=https://vignette.wikia.nocookie.net/bloodborne/images/f/fe/Cainhurst_dining_room.png/revision/latest?cb=20170728022809]paintings[/url] that could reasonably be of her.
I have my own theories on her immortality and the Vilebloods, obviously, though maybe that's better left to be touched on IC since I don't think there's anything that would change how I want to depict them at this point. You are definitely right, though: it would be naive to think the Vilebloods were/are entirely innocent, even before the Healing Church branded them as abominations for extermination. I might question [I]why[/I] they are different, though.