Camilla, Duchess of Cornwall
The 95-year-old monarch in March made her first public appearance in over five months.
Camilla invited Emerald Fennell, who portrayed her on the Netflix show, to an International Women's Day event on Tuesday.
The duchess tested positive four days after Prince Charles was confirmed to be infected.
Queen Elizabeth previously announced that the duchess would be known as queen consort when Prince Charles takes the throne.
"We are deeply conscious of the honour represented by my mother’s wish," the Prince of Wales said in a statement.
The Queen offered her blessing for her son Charles' wife to one day be known as "Queen Consort."
Camilla urged those at a reception to renew "our commitment to do everything we can to end violence against women."
The Duchess of Cambridge's Jenny Packham gown and its embellished cape turned heads at the "No Time to Die" premiere.
The 99-year-old Duke of Edinburgh has been hospitalized with an infection and a preexisting heart condition.
The Prince of Wales and his wife received their first doses of the coronavirus vaccination on Wednesday, Clarence House said.