Rejection
When Mycroft came straight home after work instead of stopping in at the Diogene's Club, the girl knew that something was wrong. She took his coat and hat before going to the kitchen, later tracking him to his study with a pot of her tea.
Her father had spoken the truth; she could steep a cup better than anyone else in London.
He was stressed, and she wanted to help. He thanked her for that, knowing that she was trying her best with what serendipity had handed her.
But when she suggested that he use her as a husband should use his wife, he became angry. He did not shout but he did raise his voice, and that was enough to make the girl cry.
He cared but said he didn't as he shooed her out of his study like a spider out a the window.