The candidates are told the results off-stage a few minutes before they’re announced - so the announcement wasn’t a surprise for her. The announcement was actually delayed several minutes because all the candidates were lined up on stage waiting and Truss was nowhere to be seen, and the audience started slow-clapping her - I think her reaction probably happened locked in a toilet cubicle during that break.

Then after the Labour winner gave his victory speech, she just wandered off-stage and out of the venue instead of giving the customary concession speech…