So did she say it??

Nicola Sturgeon (leader of the SNP in Scotland) getting on her high horse about the admission by the LibDem MP Alistair Carmichael that he was the source of the story during the election campaign that she had admitted to the French Ambassador that she would prefer to see the Conservatives win the election. The basis for this was said to be the contents of a memo of her meeting with the Ambassador written, as is standard protocol, by a civil servant who was present.  She is suggesting that Carmichael should resign. Once again, I think the pertinent question is not being asked - quite simply, is the memo a true account of what was said?