Absolutely right, she should apologise for the full 800 years.
Her apology should be for the first two hundred years when Dermot MacMurrough fled to Normandy and asked Henry to give him a hand getting his bit of land back. Henry being in Normandy because they ruled Britain. Henry (French and hardly setting foot in Britain), went over with his (Welsh) lords and kind of over stayed there welcome.
She should then apologise for Henry and his Lords helping themselves to all the land, but more so for setting up The Pale, where effectively for 200 years, Beyond the Pale went on as normal and the oppressive rule had absolutely no effect.
And she should apologise because then the Tudors (Welsh) stole the crown and Henry VIII did his reformation and made Ireland a Kindgom. She should apologise for all the fighting that then went on between different Irish families and clans for power.
Apologise again for Queen Mary (Scottish) bringing on the plantation. Then again when the Pope more or less declared war on all Protestants and sending loyal forces to Ireland to stir up more fighting against Elizabeth.
Of course she'll be really apologetic for the main bit of real oppression, murder and slavery that well known Monarch Oliver Cromwell. It's only right that the British Monarchy should apologise for losing the civil war and a seriously deranged puritan installing himself as Lord Protector.
She really needs to apologise for when the Monarchy was restored and Charles II introduced conciliation and compensation for Irish Catholics. Even when it was continued and added to by James II allowing Catholics into parliament and even when this led to another revolution in Britain where parliament disposed the king and installed William of Orange (Dutch), she should apologise for losing that one.
Then she should apologise because really since the Magna Carta and more so since Cromwell pretty much everything that followed was because of the British Parliament.
But 800 years is about right.
Sincere apologies are due, but then as far as I’ve always felt, the greatest tragedies and atrocities were visited upon the country by Parliament and remote politicians. Whether it be military action, famine inaction, religious oppression, the worst, the most memorable was always led by the Prime Minister.
I don’t want the Queen here, not out of any reason of hatred, I’m just loathed to be spending millions on a ceremonial visit that serves no purpose, diplomatically or politically.