Will the Archbishop of Canterbury be the one who places the crown on Her Majesty Queen Camilla at her & King Charles’ coronation?

No, she'll just be given a carrot to chew.

this is a good question!

If she is crowned it will be the archbishop of canterbury,it has not been decided yet if she will be crowned with charles.

Most probably that would be the same person who crowns Charles BUT you may find in this case, Camilla isn't part of the actual coronation, just a by-stander. The Archbishop who officiates may, or may not be the Archbishop of Canterbury.

The late Queen Mother WAS crowned, but in a much more simple ceremony ...

"The Queen

The Queen was crowned and anointed in a much smaller and simpler ceremony. This began immediately after the homage to the King finished, when the Queen knelt in prayer before the altar. She then went to the Faldstool, which had been placed before the altar, where she knelt under a canopy, which was held by the Duchesses of Norfolk, Rutland, Buccleuch and Roxburghe. The Archbishop anointed her, placed on her fourth finger on her right hand the Queen's ring and then crowned her, at which point the Princesses and Peeresses donned their coronets. She was then handed her Sceptre with the Cross and the Ivory Rod with the Dove, before walking over to her own throne beside the King, where she sat.[36] " Wik.

The Archbishop of Canterbury traditionally officiates at a coronation, but any bishop can perform the ceremony.

For William and Mary the coronation was carried out by the Bishop of London, others have been crowned by the Bishop of Winchester. Queen consorts are crowned at the ceremony by the cleric unless (like Caroline of Brunswick) they don't get invited.

The late Queen Mother was indeed crowned and anointed at her husband's coronation, using a new platinum crown which incorporated the Koh-i-Noor diamond.

At most, she will be a Queen Consort, not a Queen Regent.

The Archbishop only crowns the reigning monarch, so in this case, Charles. The late Queen Mother was not crowned.

Camilla won't be queen -- she'll be a consort, much the way Prince Philip is.