She is annoyed because you have cut off her free energy source. Ppl who are psy vamps generally either can not self generate enough sustainable energy. Or are energy theives and literally steal it from you because they can.
But when you cut them off from their source, they get angry, annoyed, frustrated and often act out by vocalising feelings of being slighted or guilt ridden statements.
Try not to focus on what you are feeling because that isn't the point. The point is reducing the amount of outgoing energy such that it leaves you drained.