Question on drink driving Ireland

Friend was involved in an accident by themselves, no one else hurt or injured. They were over drink driving limit. Rang 999 and reported the accident. This was on a back road, with car not obstructing road so got a lift home.

90 mins later a guard calls to the house, brings her to station to be breathalyzed. She stayed silent done the test and said she had a bottle of wine when she went home to calm herself. She said this to garda in the station.

She failed the breathalyser in the station, was given a copy of the breath test but wasn't given any kind of summons but they said she was. Yes Yes I know my friend is stupid but surely they can't go on that breath test?