Now this is, I'd wager, a big part of her sexual personality. Her mother's clearly a domme. Haley should be much more upset about the way her mother treats her than she is. She's not, because she's a sub, but she's looking for someone to replace that role in her life.
I'm not talking about being into BDSM. I'm talking about being dominant or submissive. My friend B knew she was a submissive (and into humiliation) in kindergarten. She obviously didn't associate it with sexuality back then, but she has diaries full of evidence that she knew who she was from the start.