Graaf took a taxi to the hospital with her dance partner Daniel da Siva after a severe headache forced her to cut short Tuesday evening’s training routine, TV4 reports.
At the hospital, doctors discovered internal bleeding and immediately took a decision to operate.
Graaf was in a stable condition on Wednesday but will no longer participate in the popular dance competition.
“I went and spoke to her this morning,” Let’s Dance spokeswoman Lili Assefa told TV4.
“She’s awake and is doing well under the circumstances but naturally she cannot continue with Let’s Dance.”
Graaf is the second contestant to leave the show for health reasons. Morgan “Mojje” Johansson was forced to drop out when he suffered a heart attack the day after the first episode of the current season.