Texts messages not going through to certain people?

I've been able to send texts to a certain friend for years now back and forth. Since Saturday, she hasn't been receiving only my texts, yet can receive anyone them from everyone else. I can receive her messages however. I can send texts to anyone else and they'll receive them, though. I've tried using both the default messaging app and handcent but neither produced any luck. She hasn't blocked my number and both of us are completely clueless as to what the problem is. She's on AT&T and I'm...

Texts messages not going through to certain people?

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