After reading both threads, my understanding is that Dr Lemaire does not want to have the second last name attached to her identity.
The problem is not, given my reading, that she wants everything deleted. It is fine if she does. But she certainly does not want the other last name in any combination to appear with her name.
I acted accordingly and removed the other last name. As can be seen in Dr Lemaire's papers, she has consistently used the name "Marie-Claude Lemaire" and there is no reason not to respect that request.
What I didn't look into is the situation about the award and whether she is a nuclear physicist or a particle physicist. Since there is no other person in Wikidata with the name "Marie-Claude Lemaire", a simple physicist is sufficient too.
Please everyone, remember to be kind, in particular when a person in visible distress is reaching out to the community. I am not going to list the instances of unkindness in our response to Dr Lemaire's plea, but I think they are easy to find. It is easy the case for a person who is not part of our community to misuse terminology, or not to clearly express herself. It is our job to be extra kind in these cases, and try our best to help.
I hope that the page now is in a state Dr Lemaire is content with.
I want to extend her an apology, although I am not sure she will read this message.
Best regards,
Denny Vrandečić