I think it's asking a bit much of her to expect her to interact for three days with someone who's openly accused her of breaking into his house, drinking his booze, and ahem, being in his bedroom and bed. I wouldn't keep working for someone who accused me of that, either.
As for taking the money for YDD's house sitting, he's saying that we were negligent in letting ODD get to the key. So no, I don't want his money. I know it's a bit Pride and Prejudice sounding, but it's just how we are. Brother, on the other hand, has a very different view about being called a liar or issues of deception. It's what ended his marriage.