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She does have a choice. Ever hear of a little thing called "willpower"? If you argue that that's what makes her not have a choice, then keep in mind that her own willpower, if strong enough, will keep her from talking to you. And if she doesn't think about you, but other things, then she also will not have the urge to talk to you. Knowing Letty, it's highly likely she's thinking about anything but you at the moment. You may cross her mind every now and then, but she'll definitely think about something else soon enough.
And while there is such a thing as destiny, how do you know what someone else's destiny is? The only one to control your destiny is you yourself.