I (M 30) work in the strategy department of an internationally renowned holding group. And a year ago, this colleague from the Sustainability department (let's call him Frank) started a Sustainability project to get positive scores from the sustainability auditors. 

Frank is in his fifties and has been working for this holding group for about ten years, moving from one position to another. He's a bit of a rascal, suspected since my arrival of embezzling funds... nevertheless, he's still there and it seems curious on several levels...

Anyway, Frank, one year after starting the sustainability positioning of the Group with his brand new department, is starting to receive ratings from the auditors. And these ratings are not good at all. Worse than that, they were better before he started his project. Only, rather than taking responsibility for these positioning errors, twice this month he has emailed my colleague in the strategy department with all the executive members of the Group in CC and accused her of being responsible for these bad ratings, because "she is responsible for the website where the Sustainability content is published, and it is based on this content that the auditors establish a rating" (which is not wrong). However, the content of the site is delivered by Frank and his team and he did not mention this detail in the complaint emails he sent. 

From our point of view, it is clear that he is responsible and that he is just trying to clear his name. But we don't know what to do. We know that he has strong links with these executive members of the company and my colleague would love to do something about it but is afraid of losing her job. 

I can intervene without any problem because I am only a consultant, but above all, I would like to be sure of the result before something happens to her. Any idea is good to take. Thank you in advance!