The poltergeist informs its presence as it rattles an object.
She was in her kitchen making breakfast. Her sleep was not good. Every night to early morning, she would be awakened two to three times, at regular intervals of every two hours.
It was like psychological blackmail, for money and related incentives for the witch. The witch was a connoisseur in stirring up trouble.
Midway washing a cup, she heard her teaspoon chunk in her mug on the kitchen counter. There was no one else in the kitchen.
There could be a vibration from the electric kettle thermos that was boiling. Maybe the vibration caused the teaspoon to vibrate too and that made the chink sound.
She was reminded of the rattler, who loved to rattle her boxes, pencil holder, or whatever. She told her story earlier, at https://artmater.com/the-rattling-orb-cant-compete-with-thunders-roar/