Out of office replies are automatic so you would have received an an immediate reply notifying you that she was out of office. Presumably, your parent didn't receive the same notification because your therapist was no longer out of office.

In any case, have you said to her what you have said in this post? "I think you have been rude and passive aggressive recently. Can you explain that?". As uncomfortable as this kind of interaction is, these are the kind of exchanges which have been productive for me.

Going by your previous threads, you could also add that you often perceive her to be evil or a psychopath and see what material emerges as a result of that disclosure about your feelings.