The letter was for Daguenet.

Mme Maloir herself wrote in her bold English hand, "My darling little man," and then she told him not to come tomorrow because "that could not be" but hastened to add that "she was with him in thought at every moment of the day, whether she were near or far away." "And I end with 'a thousand kisses,'" she murmured.
Mme Lerat had shown her approval of each phrase with an emphatic nod.
Her eyes were sparkling; she loved to find herself in the midst of love affairs.

Nay, she was seized with a desire to add some words of her own and, assuming a tender look and cooing like a dove, she suggested: "A thousand kisses on thy beautiful eyes." "That's the thing: 'a thousand kisses on thy beautiful eyes'!" Nana repeated, while the two old ladies assumed a beatified expression.
Zoe was rung for and told to take the letter down to a commissionaire.
She had just been talking with the theater messenger, who had brought her mistress the day's playbill and rehearsal arrangements, which he had forgotten in the morning.

Nana had this individual ushered in and got him to take the latter to Daguenet on his return.

Then she put questions to him.