This a letter from the end of the marriage of Napoleon and Marie Louise. Napoleon’s wife asserts her loyalty (and seems to continue to drive a wedge between Napoleon and his brother Joseph) about a month before she expresses disdain at the idea of being forced to join Napoleon at his exile in Elba.

My Dear Friend,
I received your letter of the 12th last night at half past midnight, I would have answered it right away, if I did not have a strong attack of fever accompanied by a great headache, now that I am better I hasten to write to you to tell you that I was very affected to think that you might think that I have more confidence in the King [Napoleon’s brother Joseph] than in you and that I would tell him things that I let you ignore.
I hope you don't believe that, because it would make me too unhappy. On the contrary, be convinced that I love you dearly, and that I would like to be able to find ways to give you proof of that.

I am very sorry to have spoken to the King about my father's letter, I had translated some sentences to reassure him because he had completely lost his head today, but you can be sure that I did not show him my answer, nor the letters you write to me, if he said that, he brags, and he lies.
The King told me yesterday that if he was not afraid of displeasing you, he would have an address for peace made, which he would have signed by all these gentlemen, the National Guard, the Council of State and the Senate, and that he would like me to send it to you.

I answered him that I did not see us doing such a thing, that it was to force the hand of the sovereign, that I was too attached to you to ever do such a guilty thing, that besides it was necessary to think that no one knew better than you what was for the good of France, and what was necessary for it, and that I find this idea very guilty.
The King replied that I spoke like a child, and he went away in a very bad mood. I assure you that I esteem him a little less every day, imagine that the day before yesterday he did everything possible to denigrate the Viceroy in my estimation.

I could not prevent myself from telling him that I had always found him to be the only one in your family about whom you had no complaints [Marie Louise complains about Viceroy Eugene in her diary], I found this very small of the King, and I do not understand what he was up to. I assure you that I wish I could have a way to no longer see him and, in general, to shut myself up in a corner of the earth where I could live ignored until the moment of your return or until the moment when I could be useful to you and prove to you all my love.
I'm sorry to think you can be mad at me, this idea really makes me very unhappy. You would be very good, my dear friend, when you receive this letter to write me immediately on a piece of paper that you don’t resent me or that you are not angry with me, I could not possibly relax until after being drawn from this awful worry.
You do not tell me anything about your health in your letter, I hope that it is good and that you do not tire yourself too much, it would still be a torment for me to know that you are sick.

Your son is doing well, he's kissing you, I haven't seen him yet this morning, and I'll tell you about his kind actions this evening. I am a little better this morning but I am still very sick, I do not know if my migraine will allow me to go to Mass. About the rest, I will do my best, but above all believe, my dear Friend, that I do all my best to satisfy you and to prove to you how much I love you. I send you this letter by an extraordinary courier, I would be glad if you receive it soon and especially that you tell me immediately that you still love me a little. I kiss you tenderly.

Your faithful Amie Louise

Paris, This March 13th, 1814 at 9 am.

Here is where Marie Louise told her oldest friend she never felt a thing for Napoleon.