Keep that customer on your books until next month when you can knock on the door to see if she has decided, most customers who think that it is steep rise will soon learn that you are invalueable to loose for over a pound.
I have been doing this trade for nearly 29 years and it was just 8 years ago when i raised my prices by just 50p and I lost two customers for that rise.
But in earnest you should raise your prices each year or if not each year, every other year as fuel prices are raised daily it seems nower days as everytime i go to fill up the price has gone up once again.
All businesses need to raise prices from time to time.
Keep smiling and be happy and piece to one and all
