Never has anyone made her so angry. Not even Kent.
Sure, she despises Kent for the man he is. In fact, she might hate him more than anyone in the world, but never has she been so angry at Kent.
Amon, here on the other hand, she doesn't hate him as much as Kent; in fact, she finds him the most physically appealing, but his attitude, the way he is treating her, the way he is looking down on her as if she is nothing but an object for his use, this pisses her off very much.
She might find Amon physically attractive, but that doesn't mean she is going to let him boss her around.
Angelica has had enough with Amon and his games; she doesn't know how he pulled that off, managing to get the guards fired while in action. Either Amon paid those idiots, or someone is watching them, keeping tabs on everything that is happening here.
And Angelica hopes that it's her first guess, because if it is the second, she doesn't know how she will deal with this situation.