no she did not go to the Camilla/Charles ceremony. it was civil because C of England wouldn't marry them due to their history, including "friendship' while married to others. the Queen did attend a ceremony of dedication later that day which was not a wedding ceremony. but i am reading that Archbishop of Canterbury offered to marry H and M - so this may end up being different. also Charles is 1st in line for throne, future head of C of England, so rules may apply to him that wouldn't apply to Harry.