Mary Todd Lincoln's faux pas (plural), worse, and much worse

[Eva Elisabeth]

Obviously I'm a bit slow on the uptake, but where's the issue about the two accounts? Does the Marquis' "we" exclude Clara Harris, or does Clara Harris' account exclude the Marquis accompanying them through the White House? I think the two just didn't pay much attention to each other, and I would guess the Marquis was a bit too proud to share the main role (as Mrs. Lincoln's guest) in his account with Clara Harris. Or did I miss another issue?