Why won't Iphone 6 ios 8.4 won't deliver text to non iphone user?

My iphone 6 (ios 8.4) won't deliver texts to someone who isn't on an iphone. I have tried powering off, rebooting, resetting network settings, turning off imessage and more but i still can't send her messages. However I can still receive all messages from her for some reason?

Do you have Send as SMS turned on in your iMessage settings? Both my adult kids have phones other than iPhone, like I have, and I have no problem sending and receiving text messages from them.

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