Is my client [name withheld] being stalked and harassed and her home vandalized by the same group of people who bothered her before, now that she is back in the US?

As you saw intuitively, her story is 100% accurate reporting in all respects. She is worrying about her interpretations, and her mind as well. This is a sign of mental health, not of mental illness, as you have seen time, and time, and time again. The delusional believe totally in their visions, and their delusional thinking, and do not question its accuracy, and what they believe to be its origins. She is being harassed systematically. They picked up her return to the country, and have followed her to her new residence, and are re-engaging with a campaign of creating fear to undermine and distract her, and to make her suffer. That is the game they are playing. They do not wish bodily harm to her, they are simply toying with her to show her that they can, to wield power over her, to make her suffer. This is the doing of a person who is a quite troubled individual, and reflects that diabolical nature.