On becoming a contestant on Strictly Come Dancing: "As a child I wrote to Blue Peter asking could I dance with Pan's People. Now at last I get a chance to earn my badge - excited doesn't cover it!"
Gibney was born in Dublin and trained to be an actress at Dublin Oscar Theatre School. After appearing in a production of Goodbye to the Hill, Brendan O'Carroll invited her to join his theatre company.
Gibney is best known for her work with O'Carroll. She has co-produced his stand-up DVDs, been the assistant director on all of his plays and co-directed the original series of Mrs Brown's Boys for RTE. She has also starred in everything he has written. Gibney stars alongside O'Carroll in the hugely popular BBC reworking of Mrs Brown's Boys. A film version, Mrs Brown's Boys D'Movie, was released in 2014. In 2014, Gibney signed up to be a contestant on Strictly Come Dancing.