The lack of Irish characters implies there is a Irish version of Hogwarts.

The English either never invited them to the Triwizard tournament because of history, or there was simply one too many drunken brawls for the Quad wizard tourney to continue.

But for real, I think she needs an editor. For all the problematic content the Harry Potter books still worked to the end as a story. Everything past that completely flew off any rails and I have the feeling there is nobody anymore who tells her “no, that doesn’t make any sense you should rewrite this”.