Please stop thinking that "project protection" is related to some sort of a power game overseen by elite gatekeepers.
A person like Marie probably has many living descendants. That's one reason why the project is involved -- and why communication is important. The main thing you need to do when editing these profiles is communicate why you are making the changes you made, so that other descendants will understand (and will be less likely to reverse your edits). Communication can be accomplished in the "explain your changes" entry, by posting on the profile message board, or by starting a G2G about the problems with the profile and your proposals to resolve the problems. The manner of communicating depends on the complexity of the situation.
For example, in this case, when you edited her current last name, it would have been helpful to mention your reasons in the "explain your changes" edit summary (presumably your reason was that French women in that era didn't use their husband's last names).