In the end, Mrs.Smith was still jealous, jealous of the things Robert did five months ago! Moreover, she was well aware of the biggest accusation against Robert - that Thomas Smith was not related by blood to Emma Smith at all!
She was accused for no reason, all because Thomas couldn't bear any stimulation due to his heart disease. As for Robert, he had his fair share of romantic debts too. If anything, marrying her daughter was him stepping up!
Robert always thought Mrs.Smith would be ruthless in dealing with him, so he was mentally prepared for it. But now, she only wanted to sting him with a few words. Honestly, this level of combat strength was nothing compared to Avery Clark. He didn't take it to heart at all.