In Irish Passenger Steamship Services Volume 2: South of Ireland (David & Charles, Newton Abbot 1971), D B McNeill writes:
In the autumn of 1964 the Ormonde Hotel at Nenagh took delivery of the Hilda from Holland. She is a modern canal cruising launch with central heating and a transparent roof. She is used for local trips on Lough Derg.
She is described as a single-screw motor vessel with a diesel engine but no further details are given. I would welcome more information about the Hilda; a photo would be very nice.