The article says Éabha is the 11th singer to join Celtic Woman. Isn't she actually the 12th singer? Here are the 11 singers that joined prior to Éabha, in alphabetical order:
Máiréad Carlin
Susan McFadden
Chloë Agnew
Órla Fallon
Lynn Hilary
Lisa Kelly
Lisa Lambe
Méav Ní Mhaolchatha
Deirdre Shannon
Alex Sharpe
Hayley Westenra