Her resigning is absurd. Now there's going to be a lag of actually governing while the knowledge transfer happens. What a literal waste of time.
Why though? At that level she won’t be involved in the modelling or the science - she will be being advised by her team; going off recommendations, overseeing the strategic part of thing; making the final decisions etc; but the actual “knowledge” that will be transferred is very little. Her deputy will have been involved all the way though, they will be eminently qualified to step up.
A large part of the CMO’s job is to be the public face of the decision making. If you can’t do that then you’re pretty shit at your job.
If she hadn’t stepped down then every single press conference from now on would have started with the questions “Why should members of the public follow the advice when even the CMO doesn’t?” “Does the CMO believe in the advice given, and if so why has she flouted the guidelines” “Why has Brenda from Glasgow been fined £1000 when the CMO got off with a warning?” “Is it one rule for the rich and privileged and one rule for the poor?”