What happens to Prince Harry and Meghan Markle if they don't leave Kate Middleton alone

Royal Expert Sally Bedell Smith told the New York Times “The palace will make sure (Harry and Meghan) leave (Kate)  alone. It would be ghoulish if they followed her to treatment. I hope they will show common decency, which maybe they don’t have in great supply. I hope they will stop speculating on all sorts of dire and ludicrous things.”“Kate doesn’t need Harry and Meghan to console her. She has her parents and a sister, and she’s very close to King Charles.” “Meghan has announced she is going down a very different road, starting a new brand with the most bizarre name”