There is no explicit accusation of Gertrude here. He does not say, “You messed up” or “You destroyed my careful plan,” or “You meddling woman.”
But my woman’s brain hears an accusation anyway. We learn very early to read the smallest of signals, to see the first hint of threat.
There isn’t a threat written here and I’ve never seen one played – but I hear one. I hear a “Watch out, Gertrude.” I hear a “You’ll pay for this later.” I hear a “Why do you ruin everything?” and a “Why did you have to come in and tell him that bad news right then?” Probably this means that I’ve known too many assholes in my life. But I would be curious to see this moment played as the threat I hear.