Of course, Tori could send the photo to her ex-boyfriends parents so that they will know what kind of "girls" their son likes. It might even the revenge scales a bit!
Oh, but she's mortified to be outed like that. I doubt she's got that in her.
Of course she is mortified, but how long until that turns to anger? We all have that in us and none more so than the woman scorned. Her ex has made a very big mistake by outing her. Remember, she no longer has anything to lose and she will soon realize that.
Maybe so, but the way I imagined the character is that she's extremely shy and not very assertive. But I have the luxury of knowing the backstory (or at least the bare bones of it). Feel free to imagine it however you want, though. That's the beauty of an open-ended story: it's ambiguous, and can be interpreted however the reader wants. And it's never wrong.