The other bit that doesn't ring true is if that memo was received but not sent to her to read then what has been going on all week? With a Home Sec apologising day after day surely someone should be going back over all the stuff and telling her after day one " actually there is this document " so she could get on the front foot and have an explanatory narrative that would be so much better than the bumbling we have witnessed ?
Maybe the big thing to learn and take away is that don't start your defence last week by bad mouthing your department as she did - I expect that from the moment she did that then for some civil servants their thoughts were " you're on your own now love. Lets see you get out of that. "