What makes you say this is going into her profit? There’s a lot of competition in coffee shops, so if what you say it’s true there’ll be someone undercutting her.

It’s more likely that besides beans her other costs have gone up, too.

It also doesn’t make sense to maintain absolute profits instead of a percentage margin. Low margin means that you aren’t hedging as much against risk (if your stock is destroyed in a fire you have to pay the cost of the stock, which has increased) and aren’t paying yourself any more in the face of the rising costs YOU are paying every day.

This idea does not adequately address reality.