Cannot initiate text messages to one contact Galaxy S6

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Android Central Question

My wife's S6 on AT&T. She cannot initiate a text to her niece's Android phone (also on AT&T). She sends them, but her niece doesn't get them. If she replies to a text her niece has sent, that goes through. Phone calls go through normally, too. Her niece recently changed phone numbers.

I have an iPhone on AT&T and am able to text her flawlessly.

We have tried deleting and recreating the contact.

Any ideas welcome.