To be honest her books are simply boring. Nobel prize in literature used to mean something, but recently it isn’t about literature anymore, it’s about “who furthers progressive-left agenda the most?”
It's quite natural: the left in general is more about the freedom of expression, "progress" as in finding new ways, whereas the right is by nature conservative, so it's harder to make new breakthroughs in art.
Perhaps that bias has something to do with it. Either way, back when Wisława Szymborska won the literature prize, there was a clear right-wing candidate, Zbigniew Herbert. They still chose the poet who wrote paeans to Stalin.
This idea that art is right or left wing purely because the authors don't support the worst head banging of western right wing parties is such bollocks.