@tenente she's an MP who Liz Truss made Leader of the House of Commons a bit of a obscure admin type role. But you also get to be Lord President of The Council. An ancient role where you are in charge of business conducted between parliament and the sovereign. Again normally obscure procedure related and some Queen Anne was the last to defy parliament's wishes when America was just a bunch of colonial outposts nothing interesting ever happens at them.
However suddenly very public if the sovereign dies. Sue swore in King Charles just after the Queen died. And at the coronation of King Charles III she got to carry the sword of state (representing the King's power).
As you see holding an 8lb sword like that for a long time ain't easy. Also she choose a very attention grabbing outfit. Suddenly where her rival had hoped to push her to the background she had a starring role in one of the biggest state events of the last 80 years. She attracted a lot of comment. She is now a strong contender to replace Sunak after the election this week.