I've had a listen to Karen Matheson's singing of this song and this is what I make of the chorus:

Thiocfadh leat, thiocfadh fanacht
Thiocfadh, thiocfadh leat imeacht
Agus cífidh * tú an saol atá romhat
Thiocfadh, thiocfadh leat

which I would translate as

You could, you could stay
You could, you could go
And you will see the life that awaits you
You could, you could

* I agree it sounds like she sings tí rather than cí but I can't make sense of the former.

Is Karen from Donegal - or is she singing phonetically?

The verses are a bit harder to make out through the rather Celtic mist - I might try them on someone with more familiarity with Donegal Irish!

Regards