Guess she didn't have Miss Goldberg to instruct her to remove "Jeff" from the sentence to determine the proper usage.
Sometimes the old methods are best. My daughter (now 26) STILL remembers "when two vowels go walking, the first does the talking..."
My mother taught me correct grammar from the time I could talk. I knew the parts of speech when I was four. She drilled grammar into us as well as spelling. She taught me more than any of my teachers. I have done the same with my kids. My son (who is not well-educated) knows his grammar and sometimes corrects his friends around me. LOL
I don’t understand how kids can graduate from college but not be able to write a paragraph with correct spelling and grammar. I am certainly not perfect, but as least I can get the basics right!