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Now it's enough with a firm "no" and she stops. Before that though I just grabbed her by the neck and carried her outside. From what I've gathered that's how cats teach their youngs and it's been a good way to strongly say no without making too big a of a deal about it. The whole 'get grabbed by the neck' seems to be a strong definer of hierarchy for cats so a good way to teach them what's ok and not.
Indoor cat unfortunately. What does firmly letting know look like? Clapping, strong words?