The official reason is because the job is not a good fit for me.
The unofficial reason is because I'm not a good fit for this job, either. Lynn doesn't need to know that part. But I'm cutting my losses and getting out of there before I get fired.
Today I looked in my file again (this is a good thing in the long run, but I still feel nosy, and I probably kind of am) and found three more notes about various things, all sounding like I'm incompetent, lazy, and all sorts of other wonderful things. Things that are mostly not true. Some of them are kind of true, but I won't go into it. I just decided that losing 20 pounds in less than a month, all stress-related, all because I am trying as hard as I can and still am not being as perfect as Lynn wants me to be, is not fair to myself. I feel like Lynn has been undermining all my efforts to make this work, though I don't think she realizes she's doing it. There's a lot of stuff to this that I'm not mentioning because I don't really want to rehash it and rehash it. But tomorrow I'm putting my notice in to the owner (Lynn is on vacation) and then I'll start trying to find someplace where I'll fit better.