I noticed last night when Sir Alan asked Raef to pick 2 people Helene wasn't told to go back to the house, or indeed walked out of the boardroom.

I checked on iPlayer just in case I missed it and nope she still wasn't there!

Did I miss it earlier on?

nope you didnt miss anything, they didnt show it
weird editing

I noticed this and I didn't see her walk out either. I wondered whether the bit where she left had been cut or shot twice, or perhaps she wasn't even there for the bit before they left.

The editor has been fired - they hadn't got a bladdy clue.

Just watched it again , nothing wrong except the editing was misleading. When Raef says he wants to bring back Micheal and Claire , Helene is sitting next to him so SAS probably told her to get back to the house then talked to the three a bit more then told them to leave the room but they edited it to seem like it was all one bit.