At the same time, isotope research is being conducted by the Vrije Universiteit Amsterdam in 2013. It was previously thought that the Heul girl was between 15 and 18 years old, but this has now been adjusted downwards, she must have been between 12 and 15 years old. But more becomes clear. She grew up in the German Eiffel. She also lived for a period in Eastern Europe, behind the Iron Curtain. Finally, the researchers determined that the girl was fed one-sided food in the months before her death. This could indicate an eating disorder, poverty or imprisonment, according to the police.