quote:My answer: Tá Gaeltacht dheas ann.
Her answer: Tá Gaeltacht deas ann.
Bit of a technicality here I think. Ever hear of the "dots after dentals" rule? I don't think it should apply here, because "deas" is an adjective.
bean dheas = a nice woman
gaeltacht dheas = a nice gaeltacht
quote:My answer: Tá tír hálainn ann.
Her answer: Tá tír álainn ann
The placement of a "h" before a vowel is not lenition. The lenition of "álainn" yields "álainn":
fear álainn
bean álainn
Likwise with your "aoibhinn" example.