Blame
Disclaimer: Premise and characters belong to Steven Moffat, Mark Gatiss, and, of course the incredible Sir Arthur Conan Doyle, I'm only borrowing them for a bit of non-profit fun.
Sally was professional, courteous and even a little curious the first time she was on a case where Sherlock Holmes was called in.
By the fifth case, Sally couldn't deny that Sherlock got results, but she utterly loathed him. It was transparently clear that he couldn't care less about the victims, had no respect for the police and liked clever murderers. She was still professional when dealing with him, but afterwards, drinking with her friends and co-workers, she was more than free with her opinion of one Sherlock Holmes.
The next time she held up the tape for Sherlock to cross under, he'd paused and leaned close to her, "Hypocrisy is one of the most unbecoming habits of normal people."
After that Sally addressed him as 'Freak'. It was the compromise he'd asked for, wasn't it? It wasn't as if she would stop expecting him to get bored with solving crimes one day.
Then came John Watson, who was decent bloke even if he had terrible taste in friends.
When she saw John After she'd wanted to tell him that she knew Sherlock hadn't been a fraud, she'd thought he'd finally gone over the rails. Being forward with her accusations was just playing by the rules. She couldn't say it, it would be like trying shift her share of the blame.