I feel that she already has. You've slept with Ashley twice after all. That being said, if you need a more "definitive" answer (that I'm definitely not spoiling, because there's no way you already guessed what it is, obviously), know that you'll get one (relatively) soon.
I'm fully sold on it, I just think her character wouldn't "fall" to it quickly, because that wasn't her kink at first. So, while the game started with you already knowing you'd enjoy it, she's just in the process of discovering how hot it can be. And I love the dynamic of discovery, that mostly disappears as soon as you get a definitive "okay, I love it".
Which is also why Tara doesn't progress too fast. Once she's fully committed, I can't go back.