Why can't I get text messages from another iPhone just from one person?

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Can't get texts from another iphone just from one person

Can't get texts from another iphone same carrier just from one person I thought my phone was defective so I went and bought a new one I upgrade from 5 to 6s but I still am not getting texts from this one contact! She gets my messages. She shows me her phone and I can see she texts me back but her texts never show on my iphone. What's up?!