How can she forgive her son for (alleged) abuse of a third party??
If it was my son I wouldn't be in a position to forgive him for having hurt someone else .
It would be up to the offended against to bestow forgiveness.
I'm not saying I'd disown them or whatever, but it certainly wouldn't be my place to forgive them for sins committed against another.
So if it was not QE's job to forgive him, and it is acceptable for her not to disown him, then the argument is not about QE at all but about how Andrew should not just suffer In the background but be seen to suffer publicly? (and I use the word suffer advisedly because he is not the victim).
No one knows the whole truth about this shameful episode other than Andrew, Guiffre and Maxwell and none of them have given any evidence in a court of law about it, or are likely to now...unless Maxwell sees something in it for her.
If Guiffre feels insulted or devalued by his appearance at the ceremony then of course that is a reason to condemn it, but otherwise I am prepared to see it as a PR mistake rather than give it any greater meaning.
Forgiveness by a public that happily continue to vote into power liars and charlatans like Johnson is not that meaningful, and even less so unless and until he does something like Profumo did by devoting his remaining years to charitable causes.