Blocked message notification

Hi, when I text a certain friend, the first one goes thru, I receive her reply, but that's where it stops. When she tries to reply to a second text in the same thread, I receive "Free Msg: unable to send - message blocking is active" even tho I am clearly not blocked, one because she is receiving the first msg, and two, cause she didn't block me. Help!THis just started - we are both Metro PCS customers...just fyi

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