Dolores,
don't try to retrace this letter. I have placed an Untraceable Charm on this parchment. I know what you are Dolores, I know what you have done, and I know that if this information got out you would be ruined. I have the power now, let's see how you like being controlled.
If you don't want this information getting out then you must take the job at Hogwarts. Get rid of Professor Trelawney from Hogwarts and your secret shall be not made known.
I will be watching you Dolores.
Do not fail me you MUDBLOOD.