I love MN Cheeky Fuckers . . .
They are the Gift That Keeps On Giving . . .
She will try to order on Friday.
Obviously you will tell her to bugger off.
There is a minuscule chance that she will then get her purse out. As she wafts away the moths, blinking in the unaccustomed light and flying clumsily into filing cabinets etc poor things, and hands you her actual cash for this Friday's lunch, you can stick it in your purse saying "Cheers - that brings your debt down to £5.50. (or whatever). When that's paid off and you have cash for your sandwich, then you can order lunch again - but as with the others, it's a pay first eat later arrangement now. Your paying at the end of the month just doesn't work for me . . . "