This morning, Mairéad, Éabha, Tara, Megan, and Gavin Murphy were on a radio program on RTÉ Radio 1 called "Sunday with Miriam". You can listen to it here:
https://www.rte.ie/radio1/sunday-with-miriam/programmes/2019/0203/1027221-sunday-with-miriam-sunday-3-february-2019/Click the "Listen" button in the "Sunday with Miriam podcast" section. There is a download button that lets you download an mp3 file of the program. (The "Sunday with Miriam" section has basically the same content but no Download button.)
Starting at
0:50, the ladies sing
Mná na hÉireann, accompanied by Gavin Murphy on the piano. I think this minimalist version of the song is quite beautiful.
Starting at
46:20, you can hear the girls giggle, followed by a brief interview with Mairéad and Éabha, and then a performance of
Sive.
Those were the only two appearances of Celtic Woman on the show.