She has worked with the bands of Sharon Shannon, Moya Brennan (of Clannad), and Mary Black, and features on albums by musicians as diverse as Dolores Keane, Mike Oldfield, Alan Stivell, Bryan Adams, Anúna, Matthias Kießling [de], Dónal Lunny, Brian Kennedy, Ronan Keating, John Renbourn, and The Chieftains.
[2][3] Máire's TV and film credits include Glenroe, Tinteán, and Voyage (part of the Waterways series), all on RTÉ; A Freezing Summer (Japan), Angela Mooney Dies Again, In the Name of the Father, The Secret of Roan Inish, Rob Roy and Moondance.
[4] Since 2007, Breatnach has been involved in the preparation of CDs and books to accompany a range of Irish language material aimed at the Naíonra and early-reading age groups.
[5] In 2013, she was conferred with a PhD by Dublin City University for her study, undertaken in St Patrick's College, Drumcondra, of the acquisition and transmission of sean-nós singing, Iomramh Aonair na nAmhrán: Sealbhú agus Seachadadh Thraidisiún an tSean-nóis i gComhthéacsanna 'Neamhthraidisiúnta'.
[6][7] In 2022, Oidhreacht Chorca Dhuibhne published Breatnach's second book for children, Mábúis – Cat ar Misean, illustrated by Dómhnal Ó Bric and aimed at readers in the 10-14 age group.