Man, that is tricky and bothersome. I hate texting. I'm with Yuzu - do you think you could ask for her email address? Have you spoken on the phone at all - would you be up to that if she was? Who gave who their number first, or suggested such? Who sent the first text? How often do you text each other, and how quick are the replies? How long were you talking on OKC before moving to the phone?
Re OKC - it may be she doesn't feel she needs it up now she's talking to you.
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Of course, it's probably quite a bit more complicated than that.
You know sometimes, between the dames and the horses, I don't even know why I put my hat on.