Nevin, who is just 15 years old, won the Best Boxer award at the tournament on Saturday but was then attacked by an offender who has been reported to be a trainer of the rival Russian team.
Irish team manager Bernie Harold explained to reporters in Ireland that Nevin was punched in the eye and has been treated by doctors for her injuries.
“We are absolutely appalled by what happened,” Harold told Independent.ie.
“We have reported it to the police in Germany and they will be pursuing it. The Irish Athletic Boxing Association, the Russian Federation and the world body will be investigating it.
“They were all put to bed, the coaches were downstairs having a cup of coffee and that’s when it happened.
“Mary Kate and another girl went to get a drink of coke from another girl in another room.
“This man came out of the room and he punched her in the eye.”
Asked how Nevin is after the incident, which obviously came out of the blue, Harold added: “She’s good. I brought her to the hospital last night and they were happy to let me bring her back to the hotel. Myself and the coaches stayed up with her through the night. She’s good.
“A report has been made to police and we are going to pursue this. We will not let this rest.”
