If the Queen gave Northern Ireland back to the Irish, wouldn't this solve the Brexit problem.?

Wasn't it Charles the2's fault?, It would be fitting is she did the decent thing and gave it back.

No, because sadly there are many people in NI who DON'T want to leave the UK at all ....

Not her Job she cannot give NI Back only the people of Northern Island can make that choice Via a referendum the last one Failed they Chose to remain

and if Erin does not like a hard Border with the UK TOUGH

No.

Nothing to do with the Queen.

How will that solve Brexit? Eire is still in The EU. N. Ireland will be out. They are two countries. They will have to rebuild the international border crossings.

The Monarchy has nothing to do with politics. HM does not own Ireland. She doesn't even own the Crown.

N. Ireland is predominantly Protestant. Those citizens Do NOT Want To Be Amalgamated with predominantly Catholic Eire. Winston Churchill's father Lord Randolph said "Ulster will Fight [against Home Rule in Ireland] and Ulster will be Right." Ulster may or may not be right; but she has fought and will fight against Eire and anyone who sells her to Eire. N. Ireland is Anglo-Irish. Oliver Cromwell and William of Orange Irish. Eire is Green-Irish.

It does not belong to her.

Irish unity may well become an objective for more people

It is not in the queen's remit to give parts of the union away. It would need the consent and co-operation of the majority of the citizens of N.I. There is absolutely NO evidence whatsoever, that the majority want unification of the island.

No it wouldn't and if you don't know why then try and work it out for yourself Dumbo.

The people of Northern Ireland aren't the Queens to give, and they have a right to determine their own destiny.

She has no power to do this, and what of the people? It is their right to vote oN rejoining the Republic, and they have done this in the past and voted to stay with the U.K.