That she has no control over her body.

Kim closes her eyes and stretches further. "Not gettin' any taller!" she hears.
Her eyes open wide and she looks around, but sees no one. "Man, I'm out of it!" she mutters to herself.
Suddenly she feels herself bending at the knees. She turns as she kneels so that when her knees hit the rug, she's in front of the toilet. She looks at her legs, but they are moving without her control. Kim grows scared as she feels her neck and spine bend forward.
It's like invisible ropes are pulling her. Her head slowly gets lower and lower towards the toilet then slowly her face hits the water in the bowl. She tries to stop herself, but soon her face is all the way underwater and her nose is in the drainage hole. She reaches up and feels for the handle then flushes the toilet.
After the water drains, she jerks her head up and falls back on her ass. Kim's breath comes fast and hard. She stands up, supporting herself against the wall. She looks in the mirror at her new swirlie.
"Enjoy that?" said the same voice she thought she heard earlier. This time is was louder and sounded as if it was in her head.