Gal is about as Irish as I am.
(Which is none, I’m 100% German/Dutch)
Welsh is not Irish. Neither is it Scots, nor British. Always remember that Wales is the ancient thumb in the eye of Britain. We’re the ones who reportedly “ate our young.” Not all of this young lady’s ancestors hail from Wales. That’s certain — immigrated there, perhaps, but her roots are not so deep. Dark hair is native to the Isle, but the rest of her features are not.
She is, however, quite lovely and will age beautifully — whether deserving of “American” teen, or not.