Yes, reward for good behavior, but KEEP BEING that same, sorta distant person, kind of slighted, until you have gotten what you deserve. She knows she's slighted you, and that you're not impressed. The undertones are there. If you suddenly go all full on and positive at the slightest bit of attention, then she knows that if she screws up like that again, recompense is only a sentence away, so there's no point behaving or appreciating you.
Reward her decent text message, with a decent one back - a bit longer, and a little bit more positive than your previous short ones, but not too much. Then she knows she's making progress but needs to try harder

Once she's behaved the way you think you deserve, you can reward her fully with your full attention.
It's like Pavlov's dog. As soon as she slips again, go distant again. She'll learn.
