If the festival will be as always - on the last Friday of June - It's a bit of a stretch with the Dublin date, but she's done multiple weekends with 3 days in a row, so it's not impossible.
Also - it haven't happened before, but if it means for Glastonbury that they need to move the festival a week earlier to book a huge act like her (the ticket sales in the US were insane, and they'll be the same in Europe) - they might do so. Maybe this is why there's two sets of Wembley dates, June and August?
It really all depends how much she wants to do it, since she was booked and the dates still make it possible, I believe that there's still a good chance that she's in.