I think most of the pub lunches are mystery shops, so she gets the money back. I was going to say more, but I've just seen the no need to wear clothes screenshot and I need to go and bleach my eyes.
I did mystery shopping for a few years and there was never enough dining mystery shops to eat in Wetherspoons every lunchtime
Also, she tends to mention when she's doing a mystery shop, in a braggy way.