Mary Lincoln's presence at Abraham's death-bed

[Eva Elisabeth]

Yesterday I was looking for this again and came across that when Tad had died, "this time Mary Lincoln had not been denied a deathbed vigil as she had with her husband and two other sons" after having nursed him mostly by herself. Also this time she attendet a brief service at Robert's house. (Jean Baker: "MTL", p. 308, paperb. ed. [in "Exile and Return"]) I checked the sources she gave for the passage ("Mary letters"), and drew a blank on a source for the part of the denied deathbed vigil at Willie's and Eddie's death.