Worked in Cork and still live close by - I know what you're saying but it's not that, it's something else entirely and I find it so hard to listen to
It's definitely a cork thing. I've lived in London longer than I care to admit and I still go up at the end of my sentences. But the way she does it is more stop and starty so it seems more of an American way of doing it, and sliiiiightly sarky. So I get you. It can be offputting.
Or, and this is my backgrounds in media training and linguistics coming into play, but it could be that she appears to be not very comfortable in her own skin right now
She seems to be under pressure (external or internal) to be a bit of an insta hun or a mini Muireann O'Connell or the louise girl who used to be on RTE radio with the blonde hair. Sorry I can't think of her name. Like the posing and the long long nails, and the blonde moneypiece (blonde doesn't suit her, sorry, it doesn't suit everyone. I've been there) and the thong swimsuits just don't seem to suit her personality or her style at all. It seems She's trying to be something she's not and that lack of confidence can often translate into the vocals- she's unsure of herself so the upflexion in tone becomes more pronounced and stilted.
She's doing incredible though, I hope she doesn't wear herself out by trying to fit into a box.