One person can't receive my texts?

One person who has AT&T can't receive my texts but I can receive hers. I have t mobile iphone 4. Everyone else gets my messages except her. She went to her carrier and AT&T said the problem was on my end. I went to t mobile and got a new SIM card but she still isn't receiving my messages. What do I do? Has this happened to anyone else?

The person blocked you.

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