I've been a bit dumb. Our cleaner is £20/hr. She came at 1pm and left at 5pm. I thought she did a nice job and I had a spare £5 note so I added it as a tip. I paid her £105 thinking she worked 5 hours.. she counted and said I had overpaid, me thinking she meant the tip I said it was ok. I then realised after she left that I should have paid her £85.
Should I ask for the £20 back/pay her £20 less next week? It was only her second time at ours and I don't want to put her off.