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McMahon had an outstanding year in 2012, winning two European medals, silver in the 50m Breaststroke at the European Long Course Swimming Championships in May and Bronze in the same event at the European Short Course Swimming Championships in December.
The 17 year old qualified and competed at the London Olympic Games and over the year she set a total of 17 Irish Records and is now the current holder of 7 Senior and 17 Junior Irish Records.
