Avoiding the Letter of Reference

She asks me for a letter of reference. I cannot write one. I avoid answering. Three or four times. She calls me early in the morning at work. I answer and she yells at me. Where is her letter? I tell her I have not written one, and I do not plan to. "You have seen me teach for years!" she argues. "I told them you were writing a letter." "Sorry," I tell her. "I cannot do it." "But you have seen me teach for years!" "No," I correct her. "I have seen you sit at your computer with your back to the children for years while your assistant has done all the work. I have never seen you teach." She gets huffy and angry and begins sputtering. Finally demanding I write the letter. I tell her I cannot, wish her well and say goodbye.