Oh yeah, NT women always would rather hear from a friend, or better yet overhear you talking to a mutual acquaintance, that you like her, rather than hearing it directly. I hope you've already tried reaching her by phone or e-mail at this point. NT women tend to follow this "2 day rule" stuff:
"IF he hasn't called you within 2 days, THEN he doesn't like you" is what the algorithm tells their brain. After that, unless they are really, really interested in you, then they won't try to reach out to you again.
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We are Taiyozoku, the Sun Tribe!