The grammar police

I was helping the daughter with her homework when I took a quick moment to dash off an email.  She caught a glimpse of what I'd typed.

"You should have proofread that," she scolded.

"Why?," I asked, "what was wrong?"

She started counting off on her fingers:

1. You should start a sentence with a capital letter.
2. You should start a letter off with Dear So-and-So.
3. You should end the letter with Love or Yours something.
4. You should use punctuation.
5. You should use your full name.

"Don't you know all this?," she finally asked, in exasperation, "even I do, and I am only in second grade."