Sally Donovan really bloody hates all the assumptions people make about her.
The rumour that she's shagging Anderson, for one. New cars aren't exactly cheap, and when the dealership started demanding the payment Sally was forced to swallow her pride and accept the humiliating offer from Anderson of cleaning his house for a couple of evenings a week. So yes, she actually had been scrubbing his floors until an ungodly hour, and so what if she'd sneakily used some of his deodorant to cover the sweat she'd worked up? She hadn't realised it would linger so.
She just wishes that Sherlock freaking Holmes would stop announcing his stupid theories to anyone within bragging distance.
Besides, Anderson?
If she were going to have an affair with any of her superiors, she'd definitely pick Lestrade.