The lawyer representing Michaella McCollum has said he is unable to disclose the details of the hearing that took place on Tuesday.
Peter Madden said McCollum accepted the charges and a sentencing hearing will take place next Tuesday 1 October.
Madden said: "I intend to travel to Lima next week to attend the sentencing hearing and after the sentence is handed down by the judge, it will be possible make further comment."
More top news
Adam Pritchard was visiting family in Iowa, USA, when he appeared to fall from his bike and later died.
A four-year-old boy is among 20 people to have died in some of the worst flooding West Virginia has seen.
The heavy showers will ease off this weekend.