Looking back, I think it's a small possibility that that de-incentivised her, though still a possibility. She seemed still down after you said it but you never know if it may have manifested later. I think a bigger mistake was your scheduling. After throwing out the first time, which she rejected, you threw out another time, which she again rejected, and then yet again, which she rejected for third time. The thing with this, is that it not only makes you look too eager and available, but it generates negative compliance momentum (she gets used to saying no). Instead, you should have asked her schedule and seen when she's free. I'm quite certain this was what put her off, though you can never be 100% unless you actually ask the girl directly and even then, she might not verbalise the true reason and instead give some rationalisation.