(The prior title went to Queen Victoria.)
It was her first public engagement since October 19.
At that time, the established line of succession will be upheld.

It was then amended in 2013’s Succession to the Crown Act.
That leaves Princes Charles and Williams.
Instead, the next in line is Charles, the Prince of Wales, perRoyal.uk.

Camilla is accompanying him.
Charles then married Camilla in 2005, which divided the British public.
Camilla is also known in Scotland as the Duchess of Rothesay.

Camilla’s title will also be out of the norm when Charles ascends to the throne.