So was it the bracelet or the demon crown that made her evil? Doesn't matter, I suppose when your character mirror mytho-historical figures the facts can kind of float. It would be an interesting challenge for the PCs, do they save the Queens dignity? Does she deserve this? Who the queen be once she is freed
It does feel a little under-done, but while adding more might the reading more enjoyable I think the idea is fully developed. Extra points for style and the fact that I hate HATE ticks (thus I demonizing theme seems like a natural extension for me).
I agree with Manfred and Checka, this is a useful item for a RPG campaign, I hope I remember to use it. You have here in this write up both a spring board for a plot and an interesting item that could offer player both meta game advantages and roleplaying directions.