She got frustrated from time to time. Upon reflection, I decided that frustration was perfectly understandable. Ok, to write a letter, the first thing you need is a piece of paper and a pen.
Pens are sticks that write, sort of like chalk but smaller and in darker colors.
Just don't write on that. Look, here's a piece of paper that you can write on. Uh, no, that's a ruler. Rulers are for measuring things. Uh, no, that's a toothpick, it's for cleaning teeth, I don't know why it's on my desk.