Tugce A., a 22-year-old student in the town near Frankfurt, reportedly tried to step into an argument in a McDonald's restaurant on November 15th.
After she had helped separate the two women and three men involved and left the restaurant, one of the men followed her and attacked her, hitting her on the temple, Bild reported.
Police reported at the time that Tugce was “an extremely critical condition” following the blow.
The 18-year-old alleged assailant is now in custody and is not responding to questions about the assault.
Doctors have reportedly decided with Tugce's parents that her life support should be withdrawn on Friday, her 23rd birthday.