Cheap me go bhfuil si an cailin is alainn sa domhan. Ansin d'oscail si a beal.
The superlative for álainn is is áille.
(I know it's an old thread, I'm just documenting it for any new readers)
Yes, though I was using it in the present tense, since you used go bhfuil.
Changing it to the past, it'd be gur(bh), or go mb(a), depending on dialect..
ise is the emphatic of í